Health ConditionsAdequate nutrition during the periconceptional and prenatal periods is important for healthy pregnancy outcomes. The term prenatal health, in the context of nutrition and natural medicine, encompasses the full spectrum of physiological adaptations, nutritional requirements, and modifiable lifestyle factors that shape the wellbeing of the pregnant person and the developing fetus from conception through delivery. It is not a disease state but rather a complex, highly dynamic period of biological transformation that is profoundly sensitive to nutritional adequacy and environmental exposures.
In contrast to the long-held concept of adult-onset diseases such as obesity, diabetes, hypertension, heart disease, and stroke, the Developmental Origins of Health and Disease (DOHaD) framework offers a new paradigm, hypothesizing that chronic diseases in later childhood and adulthood are significantly affected by environmental factors during early life. Within this framework, prenatal nutrition occupies a central role: by enhancing maternal nutritional status, health care providers can help pregnant women lower their risk of certain pregnancy complications and decrease their children's risk of adverse birth outcomes and later chronic disease.
The concept of nutritional programming was introduced into medical literature by the British physician and epidemiologist David Barker more than four decades ago. This concept assumes that during human fetal development, so-called critical periods (critical windows) are distinguished during which various metabolic and hormonal changes may occur that affect health later in life. Epidemiological factors include the impact of adverse environmental stimuli, such as deficiency or excess of a particular nutrient, and the resulting irreversible structural, metabolic, and functional damage to individual organs of the child. This process is associated with the risk of numerous metabolic diseases including type 2 diabetes, hyperlipidemia, obesity, osteoporosis, high blood pressure, and cancer.
Prenatal health involves virtually every major organ system in the maternal body, and the developing fetal systems are particularly vulnerable to nutritional status during defined developmental windows.
Obtaining the recommended amounts of all nutrients is important for a healthy pregnancy. Certain nutrients have critical roles before and during pregnancy and may be underconsumed among pregnant women. These include calcium, choline, folate/folic acid, iodine, iron, magnesium, omega-3 fatty acids, vitamin A, vitamin B6, vitamin B12, vitamin D, and zinc.
The blood levels of most vitamins decrease during pregnancy if unsupplemented, including vitamins A, C, D, K, B1, B3, B5, B6, folate, biotin, and B12. Sub-optimal intake of vitamins from preconception through pregnancy increases the risk of many pregnancy complications and infant health problems. In the U.S., dietary intake of vitamins is often below recommended intakes, especially for vitamin D, choline, and DHA.
No single food evaluated in one NIH-supported study gave enough of all six key nutrients in a reasonable serving size to bring typical diets in line with recommendations for nutrient intake during pregnancy.
Gestational weight gain (GWG) is a crucial indicator of maternal nutritional status during pregnancy and has been associated with various adverse perinatal outcomes. Achieving optimal weight gain during pregnancy is essential for the mother's and infant's health. Excessive and inadequate weight gain are both associated with complications including preterm delivery, macrosomia, and metabolic disturbances in offspring.
A special role in describing the phenomenon of conditioning the metabolism of the new human being is attributed to the theory of nutritional programming. Research in this area was pioneered by David Barker, who described the relationship between a child's birth weight, which is largely a consequence of the mother's feeding behaviour, and diseases such as ischaemic heart disease, type 2 diabetes, dyslipidemia, and high blood pressure.
The "antioxidant paradox" remains unresolved; pregnancy is a state of physiologically elevated placental oxidative stress essential for angiogenesis and immune adaptation, yet large RCTs of high-dose vitamins C (1000 mg/d) and E (400 IU/d) have consistently shown no reduction in pre-eclampsia, fetal growth restriction, or preterm birth and, in some cases, increased adverse events.
Micronutrient deficiencies are a key contributing factor to poor health and suboptimal development outcomes, especially affecting women and children who reside in low- and middle-income countries. Micronutrient deficiencies are defined as insufficient amounts of essential vitamins and minerals, which are obtained from the diet, to meet recommended daily allowances for proper health, growth, and development.
Risk of iron deficiency during pregnancy is more common later in pregnancy, among women carrying multiples, among non-Hispanic Black women, and among pregnant adolescents, whereas risk of excessive iron status is more common among Asians and Pacific Islanders.
There is mounting evidence that low to zero consumption of iodized salt, coupled with a shift away from dairy consumption as well as low seafood intakes among young women, is contributing to low intakes of iodine. However, the nature and extent of the impact of this deficit on perinatal and child outcomes is unclear.
Folate is essential for normal growth and in human health throughout the lifecycle. Clinical deficiency of folate impairs DNA synthesis and results in megaloblastic anaemia, while suboptimal folate status before and in early pregnancy results in an elevated risk of neural tube defects.
Folic acid is a synthetic form of folate used in supplements and fortified foods such as wheat and maize flour to reduce the occurrence of neural tube defects. These include spina bifida, where there is an opening in one or more of the bones of the spinal column, and anencephaly, where the head end of the neural tube fails to close. Supplementation with folic acid is internationally recommended to women from the moment they are trying to conceive until 12 weeks of pregnancy.
Evidence from four intervention trials demonstrated the effectiveness of folic acid supplementation during pregnancy in reducing the risk of megaloblastic anaemia (relative risk [RR] = 0.21; 95% CI = 0.11, 0.38). Maternal folic acid use was also significantly inversely related to the prevention of NTD at birth (RR = 0.31; 95% CI = 0.16, 0.60) and NTD recurrence (RR = 0.30; 95% CI = 0.14, 0.65).
Folic acid (400–800 µg/d) supplementation reduces neural tube defects by more than 70%.
In pregnancy, the first trimester is a significant time for neural tube closure. Decreased blood folic acid levels inhibit DNA replication, repair, RNA synthesis, histone and DNA methylation, methionine production, and homocysteine remethylation reactions that cause NTDs. Therefore, folic acid supplementation is critically important for childbearing mothers before conception and in the first trimester. Women are recommended to take 400 micrograms of folic acid per day from preconception until the end of the first trimester to prevent NTD-affected pregnancies.
A 2015 Cochrane review confirmed that folic acid prevents the first and second time occurrence of NTDs, but did not find a clear effect on other birth defects such as cleft palate, cleft lip, or congenital cardiovascular defects. The overall quality of evidence for NTD prevention has been rated as high by Cochrane reviewers. More research is needed on different types of supplementation programmes and the use of different types of supplements, such as 5-methyltetrahydrofolate (5-MTHF), particularly in countries where folic acid fortification of staple foods is not mandatory and where the prevalence of NTDs is still high.
New evidence from observational studies provides continued evidence of benefit of folic acid supplementation for preventing NTDs and no evidence of harms related to multiple gestation, autism, or maternal cancer.
Iron needs rise substantially during pregnancy to support the expansion of maternal red cell mass and to supply the placenta and growing fetus. Although iron supplementation during pregnancy improves hematological indicators, the effects on maternal and infant outcomes are not fully understood. The current thresholds and measures used to define anemia, iron deficiency, and iron-deficiency anemia during pregnancy merit reevaluation.
Iron supplementation, when compared to no iron or placebo, showed a large and significant effect on maternal anaemia, a reduction of 47% (average RR 0.53, 95% CI 0.43 to 0.65; studies = 6; participants = 15,737; moderate-quality evidence) and a small but significant effect on low birth weight (average RR 0.88, 95% CI 0.78 to 0.99; studies = 4; participants = 17,257; high-quality evidence).
Iron supplementation reduces maternal anaemia by 30–50%. For single micronutrient supplementation, improvements were noted mainly in maternal anemia with iron supplementation, and these findings highlight that micronutrient-specific supplementation should be tailored to specific groups or needs for maximum benefit.
More than 20 percent of North American females are at risk for vitamin D inadequacy or deficiency. Understanding the systemic and cellular-level effects of changes to vitamin D metabolism unique to pregnancy may help to inform vitamin D intake recommendations.
New studies have provided more evidence on the effects of supplementing pregnant women with vitamin D alone or with calcium. Supplementing pregnant women with vitamin D in a single or continued dose increases serum 25-hydroxyvitamin D at term and may reduce the risk of pre-eclampsia, low birthweight, and preterm birth. However, when vitamin D and calcium are combined, the risk of preterm birth is increased.
Important uncertainties persist regarding the optimal dosing of vitamin D in well-nourished populations. Evidence strength for vitamin D in pregnancy is thus considered moderate, with ongoing work refining dosage recommendations across populations.
The three main types of omega-3 fatty acids — docosahexaenoic acid (DHA), alpha-linolenic acid (ALA), and eicosapentaenoic acid (EPA) — are the most important in the human brain. DHA comprises approximately 40% of total fatty acids in the brain, while EPA comprises less than 1% of total brain acids.
Accumulation of DHA in the brain occurs rapidly during the second half of gestation and the first year after birth, suggesting that this is a critical period for an adequate supply from the diet, adipose stores, or synthesis from precursor fatty acids such as alpha-linolenic acid.
The typical Western diet is notably deficient with respect to omega-3 fatty acids. Studies have demonstrated that pregnant women likely consume inadequate amounts; in one Canadian study, pregnant women were found to consume only 1.5 g of omega-3 fatty acids per day, of which only 117 mg were from EPA and DHA — below what is considered adequate even for a non-pregnant woman.
A Cochrane meta-analysis synthesizing data from 70 RCTs involving 19,927 participants found modest effects of DHA supplementation on preterm births and low birth weight. While several studies demonstrate a positive impact on pregnancy outcomes, particularly in reducing preterm births and low birth weight, the effects on cognitive development are less clear.
The inconsistency of findings across trials indicates that DHA supplementation may not uniformly benefit all pregnant women or all offspring, particularly in terms of cognitive outcomes. Several factors contribute to this variability, including differences in study designs, participant characteristics, and the timing and dosage of supplementation.
The effects of prenatal omega-3 fatty acid supplements on neurocognitive development of the child likely depend on the baseline omega-3 fatty acid adequacy of the mother's diet. Despite potential health benefits, many pregnant women do not meet the recommended seafood intake of 8 to 12 ounces per week, and thus likely have intakes of long-chain omega-3s that do not meet recommended amounts.
Choline is an essential nutrient that plays a pivotal role in various physiological processes during pregnancy. It is a water-soluble amine that serves as a precursor for phospholipids, which are integral components of cell membranes. Furthermore, it is a vital component of acetylcholine, a neurotransmitter involved in numerous brain functions.
During pregnancy, the demand for choline significantly increases as it is involved in vital processes such as neural tube formation, brain development, and the synthesis of lipoproteins. It is also essential for liver function and lipid metabolism.
While choline is crucial for fetal development, studies suggest that many pregnant women do not meet the recommended dietary intake, potentially risking maternal and fetal health. This discrepancy between choline requirements and actual intake raises questions about the need for supplementation and its potential benefits. Recent research has indicated that choline supplementation might have far-reaching implications for prenatal and postnatal health, including preventing cognitive deficits, improving birth outcomes, and possibly reducing the risk of certain developmental disorders. Evidence in humans remains preliminary, and well-powered RCTs are limited.
Iodine is essential for the synthesis of thyroid hormones, which regulate fetal brain development, particularly in early gestation. Data signpost a critical period for iodine-related (thyroid hormone-mediated) neurological development early in the first trimester.
IQ benefits as high as 12–13 points were reported in a study conducted in China that optimized maternal iodine status in populations with severe iodine deficiency. A cohort study in the United Kingdom found a linear dose-response relationship between maternal iodine excretion in the first trimester and children's IQ at 8 years of age, including among those with mild to moderate iodine deficiency.
A recent systematic review and meta-analysis of the effects of iodine supplementation on thyroid function and child outcomes concluded that there is insufficient good-quality evidence to support recommendations for iodine supplementation in pregnancy in areas of mild-to-moderate deficiency. The inconsistencies in the evidence may be attributable to maternal iodine status prior to pregnancy, the dose and form of iodine supplement, the timing of supplementation, and the sensitivity of the developmental tests used. Evidence strength is therefore rated as low to moderate for iodine supplementation in mildly deficient populations.
For single micronutrient supplementation, improvements were noted in pre-eclampsia/eclampsia with calcium. Women who received vitamin D with calcium had a lower risk of pre-eclampsia than those not receiving any intervention (RR 0.51; 95% CI 0.32 to 0.80; three trials; 1,114 women, moderate quality), but also an increased risk of preterm birth. Evidence on calcium's independent effects on maternal bone mass during pregnancy remains limited.
Vitamin A is an important nutrient for fetal and maternal health, and it has two main forms: preformed vitamin A and provitamin A carotenoids, including beta-carotene, alpha-carotene, and beta-cryptoxanthin. Vitamin A supplementation, when compared to placebo, had no impact on any pregnancy outcome examined, with the potential exception of improving serum/plasma retinol. Excess preformed vitamin A is known to be teratogenic above established tolerable upper intake levels.
Epidemiological studies have demonstrated that folate, iodine, and iron intake during pregnancy impacts fetal brain development and cognitive function. Vitamin B12 is essential for the neurological development of the fetus and for the activity of folate-dependent pathways; deficiency is particularly relevant in women following vegetarian or vegan dietary patterns. Vegetarian and vegan diets require careful planning to ensure sufficient intake of key nutrients.
Magnesium participates in hundreds of enzymatic reactions and is involved in fetal skeletal development. Zinc supplementation, when compared to placebo, had no impact on any outcome examined beyond potentially improving serum/plasma zinc concentrations in low- and middle-income country settings, based on available RCTs. Evidence for both nutrients in well-nourished populations is limited.
Ginger (Zingiber officinale Roscoe), a well-known herbaceous plant, has been widely used as a flavoring agent and herbal medicine for centuries. The consumption of the ginger rhizome is a typical traditional remedy to relieve common health problems, including pain, nausea, and vomiting. Teas made from ginger (Zingiber officinale), peppermint (Mentha × piperita), or spearmint (Mentha spicata) are common folk remedies for morning sickness across many cultures.
Ginger is undoubtedly the most analyzed herbal remedy used in pregnancy. Multiple systematic reviews and meta-analyses have examined its role in pregnancy-induced nausea and vomiting (NVP).
Four RCTs met the inclusion criteria of one systematic review. All trials found orally administered ginger to be significantly more effective than placebo in reducing the frequency of vomiting and intensity of nausea. Adverse events were generally mild and infrequent. The best available evidence suggests that ginger is a safe and effective treatment for pregnancy-induced nausea and vomiting.
Another systematic review and meta-analysis included 12 RCTs involving 1,278 pregnant women. The meta-analysis found that ginger supplementation significantly reduced nausea and vomiting in pregnant women. Although the exact mechanism remains unclear, ginger is thought to regulate serotonin receptors in the gastrointestinal system. There is no evidence to suggest that ginger consumption during pregnancy increases the risk of adverse outcomes such as premature birth, low Apgar scores, or congenital abnormalities.
The use of ginger (approximately 1 g daily) for at least 4 days is associated with a 5-fold likelihood of improvement in nausea and vomiting in early pregnancy. Studies examining the improvement of nausea and vomiting in pregnancy were consistently supported, whereas other expected functions were relatively controversial. Only 43 clinical trials (39.4%) met the criterion of having a "high quality of evidence." Evidence strength for ginger in NVP is considered moderate-to-good overall. The use of ginger dietary supplements during pregnancy may be safe.
Childbearing women have been using various herbs to assist with pregnancy, labour, and birth for centuries. Red raspberry leaf is commonly ingested by pregnant women as a uterine "tonic" said to ease both morning sickness and labor. Teas made from raspberry leaf (Rubus idaeus) are used throughout pregnancy in many cultures.
Raspberry leaf has been shown to have biophysical effects on animal and human smooth muscle including the uterus. Toxicity was demonstrated when high doses were administered intravenously or intraperitoneally in animal studies. Human studies have not shown any harm or benefit, though one study demonstrated a clinically meaningful, though non-statistically significant, reduction in length of second stage and augmentation of labour in women taking raspberry leaf.
The body of evidence informed by human studies on raspberry leaf use in pregnancy does not show any benefit. Many women use raspberry leaf in pregnancy to facilitate labour and birth. The evidence base supporting the use of raspberry leaf in pregnancy is weak, and further research is needed. Authors have raised concerns that constituents in raspberry leaf (polyphenols) could compete with iron for absorption, potentially promoting anaemia in childbearing women taking raspberry leaf, though this has not been demonstrated in any studies of raspberry leaf use in pregnancy to date. Evidence strength: very weak; no demonstrated clinical benefit in human RCTs.
Asian ginseng has been used for centuries in Traditional Chinese Medicine as an adaptogenic tonic to restore and enhance vital energy. Its use during pregnancy has a traditional history in parts of East Asia, though classical Chinese medicine texts contain cautions about its use in pregnancy.
Some studies of Asian ginseng suggest it may be unsafe when taken orally during pregnancy. One of the chemicals in it has been found to cause birth defects in animals. The NCCIH notes that some studies suggest it may be unsafe when taken orally during pregnancy, as one of the chemicals in it has been found to cause birth defects in animals. The herbal products literature additionally cautions that a product purportedly containing eleuthero (also called Siberian ginseng) was taken throughout one reported pregnancy; subsequent analysis of the product showed that the herb consumed was actually Chinese silk vine (Periploca sepium), which is contraindicated during pregnancy. This case illustrates broader concerns about herbal product identity and adulteration. Evidence for Panax ginseng during pregnancy: insufficient and with safety concerns; human RCT data are lacking.
Peppermint tea and preparations have been used in Western herbal traditions and folk medicine as a remedy for nausea, indigestion, and morning sickness during pregnancy. Teas made from peppermint are common folk remedies for morning sickness.
Formal clinical trial evidence specifically on peppermint for pregnancy-induced nausea is very limited. Peppermint is generally considered safe as a food-level ingredient, but high-dose supplemental use during pregnancy has not been well characterized in prospective human trials. Evidence strength: insufficient for supplemental dosing.
The global prevalence of herbal medicine use among pregnant women ranges from 7% to as high as 55%, depending on the region and access to conventional healthcare. Lack of adequate regulation of herbal products in the United States complicates their use. Herbal products may contain different herbs than are stated on the label, be adulterated with other drugs, or be contaminated with heavy metals or bacteria, some of which might cause adverse effects during pregnancy.
Up to 18–40% of commercially available prenatal supplements contain undeclared pharmaceuticals, heavy metals, or incorrect dosages.
The traditional Mediterranean diet is characterized by high intakes of vegetables, fruits, cereals, nuts, and legumes, moderate intakes of dairy products, fish, and wine during main meals, and low intakes of red meat, with olive oil as the main source of added fat. It has been extensively explored for its high polyphenol content, exhibiting anti-inflammatory and antioxidant properties.
In RCTs, the maternal Mediterranean diet significantly reduced the incidence of gestational diabetes mellitus (OR 0.56; 95% CI: 0.34, 0.93), as well as small for gestational age births (OR 0.55; 95% CI: 0.35, 0.88). In cohort studies, the highest adherence score to the maternal Mediterranean diet was inversely associated with a lower risk of gestational diabetes mellitus (OR 0.82), pregnancy-induced hypertension (OR 0.73), pre-eclampsia (OR 0.77), preterm delivery (OR 0.67), low birth weight (OR 0.70), and intrauterine growth restriction (OR 0.46).
Higher Mediterranean diet adherence lowers gestational diabetes risk in cohorts and RCTs; Mediterranean diet adherence is linked to reduced risk of preterm delivery; the Mediterranean diet is associated with lower risk of low neonatal birth weight; evidence for pre-eclampsia is inconsistent across cohorts and RCTs.
One research group explored maternal prenatal intake of a Mediterranean-style diet on child neurodevelopmental disabilities, especially in children born to mothers with metabolic disturbances. Adherence to this dietary pattern was protective against neurodevelopmental disabilities, especially among children born to mothers with obesity and/or diabetes.
In the ESTEEM trial, mothers who followed the Mediterranean-style dietary intervention gained less gestational weight (mean 6.8 versus 8.3 kg; adjusted difference −1.2 kg, 95% CI −2.2 to −0.2, p = 0.03). When findings from the ESTEEM trial were pooled with similar trials using random effects meta-analysis, there was a significant reduction in gestational diabetes (OR 0.67, 95% CI 0.53–0.84, I² = 0%).
Vegetarian and vegan diets require careful planning to ensure sufficient intake of key nutrients. Nutrients of particular concern include iron, vitamin B12, calcium, iodine, zinc, and long-chain omega-3 fatty acids (DHA and EPA), which are predominantly found in animal products. Supplementation is typically recommended to address these gaps.
To address the issue of multiple, concurrent micronutrient deficiencies, UNICEF, the United Nations University, and the WHO developed a multiple-micronutrient tablet called UNIMMAP, which provides daily recommended intakes of vitamins A, B1, B2, B6, B12, C, D, and E, niacin, folic acid, copper, selenium, and iodine, with 30 mg of iron and 15 mg of zinc for pregnant women.
Among maternal lifestyle factors, it is well established that adequate physical activity level during pregnancy is safe and can affect pregnancy outcomes beneficially. Regular moderate physical activity during pregnancy has been associated in prospective studies with reduced risk of excessive gestational weight gain, gestational diabetes, and pre-eclampsia, though the evidence base varies by activity type and intensity.
Maternal alcohol consumption and smoking are salient predictors of pregnancy and fetal outcomes, including small for gestational age birth. No safe level of alcohol consumption in pregnancy has been established in the literature.
The NIH ODS reference tables indicate that during pregnancy, the recommended dietary allowances include protein at 71 g/day, carbohydrate at 175 g/day, and dietary fiber at approximately 28 g/day, alongside a total water adequate intake of 3.0 L/day from all sources. The protein RDA is 71 g/day, the fiber adequate intake is 28 g/day, and if constipation is an issue, increasing fiber gradually with increased fluids and fiber-rich foods such as beans, oats, berries, and vegetables is recommended.
In addition to long-chain omega-3s, seafood provides other essential nutrients including vitamin D, calcium, potassium, iron, choline, iodine, and magnesium. Several professional societies, government agencies, and public health organizations recommend seafood consumption during pregnancy, and some recommend additional DHA and/or EPA intake.
Maternal nutritional status and dietary patterns represent key determinants of pregnancy outcomes and long-term health of the offspring, through metabolic, epigenetic, and developmental programming mechanisms. Nutrition is an environmental risk factor playing a pivotal role in predisposing to various diseases. Especially prenatal nutrition induces adaptation processes, known as early programming, leading to the alteration of fetal growth and brain development.
ALA is the essential plant-based omega-3 fatty acid and the dietary precursor to EPA and DHA, though conversion is limited (less than 5–15%). The NIH ODS establishes an Acceptable Macronutrient Distribution Range for ALA (0.6–1.2% of energy) during pregnancy. ALA is the primary omega-3 source for vegetarian/vegan pregnant women, with dietary guidance emphasizing adequate ALA intake alongside pre-formed DHA supplementation to meet fetal neurodevelopment needs.
Algal oil is the primary plant-based (vegan-friendly) source of long-chain omega-3 DHA for prenatal supplementation. Clinical studies confirm algal oil DHA supplementation during pregnancy raises maternal and fetal DHA status equivalently to fish oil. It is recommended by ACOG and dietary guidelines as the sustainable, contaminant-free DHA source for vegetarian and vegan pregnant women and is used in many commercial prenatal vitamins.
Asparagus officinalis is one of the richest dietary sources of folate, with a half-cup providing approximately 134 mcg (roughly 33% of the recommended 400 mcg daily, and higher portions approaching the 600 mcg prenatal recommendation). Adequate folate is established by mainstream medical and nutritional authorities to reduce neural tube defects such as spina bifida. This is a well-established nutritional relationship.
Beta-carotene is the provitamin A carotenoid used safely in prenatal supplements as an alternative to preformed retinol, which is teratogenic at high doses. As a regulated precursor to vitamin A, it supports fetal organogenesis, immune function, and vision without teratogenic risk. The NIH ODS specifically notes that the UL for vitamin A during pregnancy does not apply to beta-carotene, making it the preferred prenatal vitamin A source.
Bifidobacterium species are key prenatal and neonatal microbiome components. Maternal supplementation during pregnancy with Bifidobacterium strains has been studied for reducing gestational diabetes, preterm birth complications, and establishing neonatal gut colonization with health-promoting bacteria. Systematic reviews of probiotics in pregnancy consistently include Bifidobacterium-containing formulations among the most studied and promising interventions.
Bifidobacterium lactis (B. animalis subsp. lactis, particularly strain BB-12) is one of the most widely used probiotic strains in pregnancy research. In a landmark Finnish RCT, formulations including B. lactis BB-12 significantly reduced GDM incidence (13% vs. 36%, p=0.003). It has also demonstrated improved neonatal gut colonization and reduced infantile atopic disease in multiple RCTs.
Bifidobacterium longum is a probiotic species studied in prenatal formulations for reducing gestational diabetes, improving maternal gut microbiome composition, and colonizing the neonatal gut with health-promoting bacteria. As a component of multi-strain probiotic supplements used in pregnancy RCTs, B. longum contributes to reductions in GDM risk and neonatal atopic disease seen in systematic reviews.
Bovine liver is exceptionally rich in folate, B12, heme iron, choline, and preformed vitamin A — nutrients that are critical for fetal neural tube development, brain formation, and prevention of maternal anemia. Folate reduces neural tube defect (NTD) risk; choline and B12 are critical for fetal brain development. However, excessive preformed vitamin A from liver can be teratogenic at high doses.
Broccoli is a rich dietary source of folate (vitamin B9), which is essential for fetal neural tube development. Adequate folate intake from foods including broccoli is a well-established public health recommendation to prevent neural tube defects in early pregnancy.
Brussels sprouts are a meaningful source of folate (vitamin B9), which is essential for fetal neural tube development, DNA synthesis, and cell division. Adequate folate intake before and during early pregnancy is a well-established strategy for preventing neural tube defects such as spina bifida.
DHA is essential for fetal brain and retinal development, and calamari oil's high DHA content directly supports this need. Prenatal DHA supplementation is widely recommended and studied in RCTs. DHA is selectively concentrated in fetal brain and retinal tissues during the third trimester, and lower maternal DHA levels are linked to adverse neurodevelopmental and mood outcomes.
Calcium is critical for fetal skeletal development and is recommended by WHO, ACOG, and multiple professional societies for pregnant women with low dietary intake to reduce preeclampsia risk. Calcium supplementation of 1,500–2,000 mg/day reduces preeclampsia incidence significantly in RCTs. About 21.2% of US pregnant women have dietary calcium intakes below the estimated average requirement, and NIH ODS specifically lists calcium among critical prenatal nutrients.
Vitamin A—supplied via dietary beta-carotene—is essential during pregnancy for fetal organogenesis including development of the eyes, lungs, heart, and nervous system. Beta-carotene is recommended as a safer provitamin A source in pregnancy because, unlike preformed vitamin A, it does not carry teratogenic risk at high intakes. Deficiency is associated with night blindness, anemia, and increased infant mortality.
Cauliflower provides two key prenatal nutrients: folate (vitamin B9) and choline. Folate is essential for neural tube closure; cauliflower is a documented dietary source. Choline is critical for fetal brain development and membrane formation, and approximately 90–95% of pregnant women fail to meet the recommended intake.
A clinical trial in pregnant Japanese women demonstrated that daily chlorella supplementation significantly reduced the incidence of pregnancy-associated anemia, proteinuria, and edema. Chlorella's high content of folate, iron, and vitamin B12 supports its use as a prenatal micronutrient source.
Choline is recognized as an essential nutrient critical for fetal neural tube formation, brain development, and placental function. ACOG specifically recommends choline supplementation during pregnancy; over 90–95% of US pregnant women fail to meet the AI of 450 mg/day. Lower circulating choline is associated with increased NTD risk (meta-analysis finding), and prenatal choline supports fetal neurodevelopment in systematic reviews. NIH ODS lists choline among critical prenatal nutrients.
DHA from cod liver oil supports fetal brain and retinal development; vitamin D supports fetal bone mineralization. CLO use during pregnancy has been associated with reduced perinatal complications in gestational diabetes. Evidence from a Norwegian study links prenatal CLO use with lower type 1 diabetes risk in offspring.
Collard greens are among the best natural sources of folate, and adequate folate intake during early pregnancy is strongly evidence-based to prevent neural tube defects such as spina bifida. Doctors recommend at least 400mcg folate daily for women who may become pregnant. Collards also provide iron, calcium, and vitamin C relevant to maternal and fetal health.
Copper is an essential nutrient during pregnancy, required for fetal brain, heart, vascular, skeletal, and immune development. Maternal copper requirements increase during gestation. Low maternal serum copper has been associated with premature delivery and impaired fetal growth indices. Copper deficiency during embryogenesis causes gross structural and biochemical abnormalities.
Alpha-tocopherol is recognized as essential for normal fetal development, particularly through the alpha-tocopherol transfer protein (TTPA) which actively concentrates it at the placenta. Severe deficiency is associated with fetal reabsorption in animals and neural tube defects in rodents; human evidence is more limited, and high-dose supplementation in pregnancy is not recommended beyond correcting deficiency.
DHA is the primary structural omega-3 fatty acid in fetal brain and retinal membranes, critical during third-trimester brain growth. The NIH ODS and ACOG list omega-3 fatty acids/DHA among nutrients underconsumed during pregnancy. A Cochrane meta-analysis of 70 RCTs (19,927 participants) found omega-3 (mainly DHA) supplementation reduced preterm births before 34 weeks by 42%. ACOG and Dietary Guidelines for Americans recommend 250–375 mg EPA+DHA/day for pregnant women.
DHA is a critical structural nutrient for fetal brain and retinal development, accumulating rapidly in neural and retinal tissue during the third trimester. Maternal DHA supplementation is associated with improved infant neurodevelopment and visual acuity. International guidelines recommend 200 mg/day DHA from mid-pregnancy.
Eggs are a leading dietary source of choline, DHA, lutein, zeaxanthin, and folate co-factors critical for fetal brain and neural tube development. A Cornell University RCT demonstrated that higher maternal choline intake during the third trimester produces measurably faster infant information processing, a cognitive indicator, and analyses of prenatal nutritional data link egg intake to fetal brain maturation scores.
EPA is studied alongside DHA in prenatal supplementation for maternal and fetal outcomes including inflammation, lipid profiles, and neurodevelopmental support. EPA specifically contributes anti-inflammatory actions during pregnancy. DHA is the primary omega-3 for fetal brain development, but EPA plays a complementary anti-inflammatory and triglyceride-lowering role.
EPA is a long-chain omega-3 fatty acid co-supplemented with DHA in prenatal formulations. Evidence from RCTs and meta-analyses shows combined EPA+DHA supplementation during pregnancy reduces preterm birth risk and postpartum depression through anti-inflammatory mechanisms. EPA plays an important role in facilitating DHA transfer across the placenta. ACOG and dietary guidelines recommend combined EPA+DHA intake for pregnant women.
Fava beans are an exceptionally rich source of folate and iron, both of which are essential for healthy fetal development and prevention of maternal anemia. One cup of cooked fava beans provides approximately 40–50% of the daily folate requirement. WHO recommends daily folate and iron intake during pregnancy to prevent neural tube defects and anemia.
Fish oil is the most-studied source of prenatal omega-3 DHA and EPA. A Cochrane meta-analysis of 70 RCTs involving 19,927 pregnant women found omega-3 (fish oil) supplementation reduced preterm births before 34 weeks by 42% and reduced low birthweight. ACOG recommends 250–375 mg EPA+DHA per day during pregnancy, with fish oil supplements as the primary alternative for women with limited seafood intake.
Folic acid is the most established prenatal nutrient, with strong evidence from RCTs and observational studies showing periconceptional supplementation (400–800 µg/day) reduces neural tube defect (NTD) risk by more than 70%. The NIH ODS, WHO, ACOG, and NICE all recommend routine supplementation before and during early pregnancy. It also reduces megaloblastic anemia risk and may lower preeclampsia and preterm birth risk.
Folate, including folinic acid, is essential for periconceptional supplementation to reduce neural tube defect (NTD) risk. The WHO recommends 400 µg/day of folate before and during early pregnancy. High-risk groups (e.g., prior NTD-affected pregnancy) are advised to take 4–5 mg/day. Folinic acid bypasses the DHFR enzyme step, making it a bioavailable alternative to folic acid for supporting fetal development.
Garbanzo beans are one of the richest plant-food sources of folate (vitamin B9), the key nutrient for preventing neural tube defects in the developing fetus, as well as iron (≈4.7 mg/cup cooked, ~26% DV) essential for maternal erythropoiesis and fetal development. Half a cup of chickpea flour provides approximately 50% of the daily folate value.
Ginger is among the best-evidenced nonpharmacological treatments for nausea and vomiting of pregnancy (NVP). Multiple systematic reviews and RCTs support its efficacy. ACOG states ginger has shown beneficial effects for NVP and considers it a nonpharmacological option; UK NICE includes ginger among acceptable therapies for early pregnancy NVP. An RCT (n=291) found ginger equivalent to vitamin B6 (75 mg/day) for nausea, retching, and vomiting.
Myo-inositol has been included in evidence-based prenatal supplement recommendations for its roles in neural tube defect prevention and gestational diabetes risk reduction. Multiple Italian RCTs of myo-inositol supplementation (2–4 g/day) during pregnancy demonstrate significant reductions (approximately 50%) in gestational diabetes risk. The NIH-funded evidence-based prenatal supplement review (PMC 9275129, 2022) specifically included inositol in prenatal supplementation recommendations.
Iodine is essential for maternal thyroid hormone production, which drives fetal CNS myelination and brain development. Maternal iodine deficiency is associated with miscarriage, stillbirth, congenital hypothyroidism, and irreversible cognitive impairment in offspring. WHO, ACOG, NICE, and NIH ODS all recommend iodine supplementation during pregnancy. NIH ODS lists iodine among nutrients with critical prenatal roles that are underconsumed.
Iron is a universally recommended prenatal supplement: requirements nearly double during pregnancy to support expanded blood volume, placental development, and fetal iron stores. RCTs confirm iron supplementation prevents iron-deficiency anemia, the most common cause of anemia in pregnancy, which is linked to preterm birth, low birthweight, and impaired infant cognitive development. WHO, ACOG, and NIH ODS all recommend routine iron supplementation during pregnancy.
Kelp is one of the richest natural sources of iodine, an essential nutrient for fetal brain and thyroid development. NIH ODS confirms iodine sufficiency during pregnancy is critically important for proper fetal development; severe deficiency causes irreversible neurodevelopmental damage. Kelp-derived iodine can contribute meaningfully to meeting the increased maternal requirement of 220–250 µg/day.
Multiple RCTs and meta-analyses show that prenatal oral L-arginine in high-risk pregnancies significantly reduces rates of intrauterine growth retardation, preterm birth, and respiratory distress syndrome while increasing birthweight, gestational age, and Apgar scores. L-arginine also reduces risk of preeclampsia and lowers blood pressure in women with hypertensive disorders of pregnancy.
Lactobacillus acidophilus is a probiotic strain included in several prenatal probiotic formulations with evidence for reducing gestational diabetes risk, improving maternal gut microbiome composition, and potentially reducing neonatal atopic disease risk. Multiple systematic reviews of probiotics in pregnancy include L. acidophilus-containing interventions among the beneficial formulations studied.
Lactobacillus crispatus is considered one of the most protective vaginal Lactobacillus species during pregnancy; a dominant L. crispatus vaginal environment is associated with significantly reduced risk of preterm birth, bacterial vaginosis, and ascending infections. Its importance is supported by multiple observational cohort studies and emerging RCT data on vaginal probiotic interventions.
Depletion of L. jensenii in the vaginal microbiome during pregnancy is associated with preterm birth and spontaneous rupture of membranes. A 2023 genomic profiling study found L. jensenii strains from preterm pregnancies are phylogenetically distinct from those of full-term pregnancies, with strain-specific genetic signatures potentially linked to adverse outcomes. The evidence underscores that strain identity, not just species presence, matters in prenatal contexts.
Lactobacillus reuteri is a probiotic strain with evidence from RCTs for reducing neonatal outcomes including colic and atopic disease when supplemented during pregnancy. Maternal supplementation has also been studied for colonization effects, Group B Streptococcus (GBS) reduction during pregnancy, and multi-strain probiotic formulations containing L. reuteri have been shown in meta-analyses to reduce GDM risk.
Lactobacillus rhamnosus (particularly strain GG) is one of the most-studied probiotic strains in pregnancy, with RCT evidence supporting reductions in gestational diabetes mellitus risk, preterm birth-associated complications, and neonatal atopic disease. A landmark RCT found L. rhamnosus GG significantly reduced GDM incidence (13% vs. 36%, p=0.003) from first trimester supplementation. International expert consensus (2025) included probiotics among supplements reviewed for pregnancy.
Lactoferrin is an iron-binding glycoprotein with evidence from multiple RCTs for improving iron status and reducing iron-deficiency anemia in pregnancy with fewer GI side effects than ferrous sulfate. A systematic review of 9 RCTs found bovine lactoferrin supplementation significantly improved hemoglobin, ferritin, and transferrin saturation compared to ferrous sulfate. Additional evidence suggests lactoferrin supplementation may reduce preterm birth and neonatal infection risk.
Magnesium is an essential mineral for muscle relaxation, bone development, and blood pressure regulation during pregnancy, with levels declining if unsupplemented. Inadequate magnesium intake is linked to gestational diabetes, preeclampsia, preterm birth, and low birthweight. A Cochrane review found magnesium supplementation was associated with significant reduction in low birthweight risk. NIH ODS lists magnesium among critical prenatal nutrients underconsumed by pregnant women.
Adequate MeCbl (as the active form of B12) is essential during pregnancy for fetal brain development, myelination, DNA methylation, and prevention of neural tube defects. Maternal B12 deficiency is associated with impaired placental development, adverse neurodevelopmental outcomes in offspring, and megaloblastic anemia. MeCbl has been used prenatally in cases of maternal cobalamin metabolic defects.
Okra is a notable dietary source of folate, essential for neural tube development, DNA synthesis, and fetal brain and spinal cord formation. A PMC-indexed study examined okra's impact on the nutritional status of pregnant women in Ethiopia. Okra has also been used traditionally by pregnant women across Africa for various gestational complaints.
Omega-3 fatty acids (primarily DHA and EPA) are widely recommended during pregnancy by NIH ODS, ACOG, and WHO (conditional) to support fetal brain and eye development, reduce preterm birth risk, and lower postpartum depression risk. A Cochrane meta-analysis of 70 RCTs (19,927 participants) found omega-3 supplementation reduced preterm births before 34 weeks by 42%. NIH ODS lists omega-3 fatty acids among nutrients with critical prenatal roles that are underconsumed.
Red palm oil supplementation during pregnancy has been shown in clinical trials to significantly improve maternal vitamin A status, reduce vitamin A deficiency rates, and lower anemia prevalence. Maternal RPO consumption also increases provitamin A carotenoids transferred to the fetus and subsequently to breast milk, benefiting infant micronutrient status.
Vitamin A (as retinyl palmitate) is an essential micronutrient during pregnancy for embryological development, organogenesis, and fetal immune system maturation. WHO recommendations address maternal vitamin A supplementation, particularly in deficiency settings.
Peanuts are rich in folate (up to 60% RDA per 100 g), providing a key nutrient for preventing neural tube defects and supporting fetal brain development. Adequate folate intake during pregnancy is robustly linked to reduced neural tube defect risk, recognised by the WHO. Peanuts also provide iron, magnesium, and B vitamins relevant in pregnancy.
PC is the primary dietary form of choline, an essential nutrient for fetal brain development, membrane biosynthesis, and epigenetic programming. Pregnancy dramatically increases demand for PC/choline for fetal tissue expansion and neurodevelopment. Maternal PC supplementation has been studied in RCTs for infant neurocognitive outcomes.
Phosphorus is essential for fetal skeletal ossification, ATP production, and cellular development. During pregnancy, phosphate homeostasis is significantly altered, and adequate intake supports fetal bone and organ development. Preterm infants particularly face risk from inadequate calcium-phosphorus supply.
Progesterone is essential for pregnancy maintenance, preventing preterm labor, and supporting implantation. Vaginal progesterone reduces preterm birth risk in women with a short cervix. Progestogen supplementation is standard in IVF luteal phase support and is used to prevent recurrent miscarriage in high-risk women.
Raspberry leaf is the most widely used herbal supplement in pregnancy and has been the subject of multiple clinical studies examining labor outcomes. A 2024 prospective observational study (n=91) found raspberry leaf strongly predictive of women not requiring medical augmentation of labor, with shorter labor phases and lower rates of cesarean section. A 2000 retrospective study of 108 women found no identified side effects and a suggestion of reduced pre/post-term gestation. However, a 2021 systematic integrative review concluded the evidence base is weak and an RCT is urgently needed.
Selenium is an essential trace mineral with critical roles in antioxidant defense via glutathione peroxidases, thyroid hormone metabolism, and immune function. Blood selenium levels decline during pregnancy without supplementation. Poor selenium status is associated with miscarriage, preeclampsia, preterm delivery, and gestational diabetes. Evidence-based prenatal supplement recommendations (PMC 8229801, 2021) specifically recommended selenium supplementation during pregnancy.
Spinach is a primary dietary source of folate, essential for neural tube closure and fetal DNA synthesis. Folate adequacy during periconceptional period and early pregnancy is established by strong clinical evidence to prevent neural tube defects. Spinach also provides iron, needed for expanded maternal erythropoiesis during pregnancy.
Vitamin A is essential for fetal organogenesis, immune function, and vision development, with blood levels declining during pregnancy without supplementation. WHO recommends vitamin A supplementation in deficiency areas to reduce maternal night blindness and infant mortality. NIH ODS lists vitamin A among nutrients with critical prenatal roles. Care is taken to stay below the teratogenic UL of 3,000 mcg RAE/day for preformed vitamin A.
Thiamine (vitamin B1) is essential for carbohydrate metabolism and neural development, with blood levels declining during pregnancy. An international expert Delphi consensus panel (PMC 11744953, 2025, n=35 experts) listed thiamine among micronutrients important during pregnancy. Deficiency in pregnancy can cause Wernicke's encephalopathy and is associated with fetal cardiac and neurological abnormalities; it is especially critical in women with hyperemesis gravidarum.
Vitamin B12 is critical during pregnancy for hematopoiesis, myelination, and DNA methylation; deficiency is associated with NTDs, preeclampsia, low birthweight, and cognitive deficits in offspring. A systematic review of 7 RCTs found beneficial effects of B12 supplementation on offspring neurocognitive development. NIH ODS and ACOG list vitamin B12 as a critical prenatal nutrient, especially important for vegetarian and vegan pregnant women.
Riboflavin (vitamin B2) is essential for energy metabolism and fetal growth, with blood levels declining during pregnancy without supplementation. The WHO UNIMMAP multi-micronutrient supplement for pregnancy includes riboflavin, and an international expert consensus panel (2025) listed it among important prenatal micronutrients. Observational studies have associated low riboflavin intake with increased preeclampsia risk; the RDA increases to 1.4 mg/day during pregnancy.
Niacin (vitamin B3) is a precursor to NAD+, and deficiency during pregnancy has been linked to miscarriage and multiple congenital malformations via NAD+ deficiency in a landmark 2018 NEJM study. Blood niacin levels decrease during pregnancy without supplementation. An evidence-based prenatal supplement review (PMC 9275129, 2022) recommended niacin supplementation; the RDA increases to 18 mg NE/day during pregnancy.
Niacinamide (nicotinamide, the amide form of niacin B3) is the form most commonly used in prenatal vitamins due to its absence of vasodilatory flushing. As an NAD+ precursor, it is critical for fetal DNA repair and energy metabolism during organogenesis. A landmark 2018 NEJM study found maternal NAD+ deficiency from niacin/nicotinamide deficiency causes congenital malformations; niacinamide rescued this phenotype in mice.
Vitamin B5 (pantothenic acid) is a component of coenzyme A essential for fatty acid synthesis and energy metabolism. Blood levels decline during pregnancy without supplementation. An evidence-based review of 188 prenatal supplements (PMC 9275129, 2022) identified pantothenic acid among vitamins that decline during pregnancy and recommended it for prenatal supplementation. The AI increases to 6 mg/day during pregnancy.
Vitamin B6 (pyridoxine) has established evidence for reducing nausea severity in early pregnancy and is recommended by ACOG as a first-line nonpharmacological option for pregnancy nausea and vomiting. NIH ODS and WHO both recognize its role in pregnancy, and it is listed among nutrients underconsumed during pregnancy. A Cochrane review supports its use for nausea management; an RCT (n=291) found it equivalent to ginger (75 mg/day) for NVP reduction.
Biotin (vitamin B7) levels decrease substantially during pregnancy; approximately half of US pregnant women show biomarkers of mild biotin deficiency. Animal studies demonstrate biotin deficiency during pregnancy may cause birth defects including facial and limb malformations and impaired fetal development. An evidence-based prenatal supplement review (PMC 9275129, 2022) recommended approximately 100 mcg/day biotin supplementation during pregnancy.
Folate (natural food-form vitamin B9) is essential for fetal neural tube closure, DNA synthesis, and cell division during pregnancy. The NIH ODS specifically lists folate/folic acid among nutrients with critical prenatal roles that are underconsumed. Adequate periconceptional folate reduces NTD risk by over 70% and supports prevention of megaloblastic anemia. The RDA increases to 600 mcg DFE/day during pregnancy.
5-Methyltetrahydrofolate (5-MTHF) is the biologically active circulating form of folate used in prenatal supplements, especially for women with MTHFR gene variants that reduce folic acid conversion efficiency. Clinical trials show it effectively raises serum folate levels. EU and several national health authorities have approved 5-MTHF as a bioequivalent alternative to folic acid for NTD risk reduction during pregnancy.
Vitamin C is listed by NIH ODS and ACOG among nutrients with critical roles during pregnancy. Blood levels decline during pregnancy without supplementation. Vitamin C substantially enhances non-heme iron absorption—clinically important for preventing iron-deficiency anemia in pregnancy. Small intervention studies suggest it may reduce risk of premature rupture of membranes and urinary tract infections, though high-dose combinations with vitamin E for preeclampsia have not shown benefit.
Vitamin D is among the most studied prenatal micronutrients, essential for calcium absorption, fetal skeletal development, immune function, and fetal brain development. Severe deficiency causes maternal and fetal rickets; observational and RCT evidence links deficiency to gestational diabetes, preeclampsia, preterm birth, and neurodevelopmental disorders in offspring. Vitamin D insufficiency affects up to 47.9% of individuals globally, with especially high rates in pregnant women. WHO, ACOG, and NICE all give conditional-to-strong recommendations for prenatal supplementation.
Vitamin D3 (cholecalciferol) is the most bioavailable and clinically preferred form of vitamin D for prenatal supplementation, demonstrating superior ability to raise serum 25(OH)D levels compared to D2. Used in the majority of prenatal RCTs, it supports fetal skeletal development, reduces preeclampsia risk, and supports neonatal immune and neurodevelopmental outcomes. ACOG and NICE specifically reference vitamin D3 in their prenatal supplementation contexts.
Vitamin E is a fat-soluble antioxidant whose blood levels decline during pregnancy without supplementation. A Mendelian randomization study (2024, UK Biobank + FinnGen) found genetically predicted higher vitamin E levels were inversely associated with spontaneous abortion risk (OR=0.993, p=0.005). It is included in prenatal supplement recommendations. However, high-dose supplemental vitamin E combined with vitamin C for preeclampsia prevention is not recommended based on large RCT evidence.
Vitamin K plays critical roles in fetal bone development and coagulation factor synthesis. Blood levels decline during pregnancy without supplementation. It is included in evidence-based prenatal supplement reviews and in international expert consensus recommendations for pregnancy. Neonates are routinely given vitamin K at birth to prevent hemorrhagic disease, and maternal vitamin K status during pregnancy affects neonatal coagulation and bone development.
Wheat germ is a significant natural source of folate (folic acid), iron, zinc, and B vitamins essential for fetal development and maternal health. Adequate periconceptional folate reduces neural tube defect risk by up to 80%. Wheat germ's folate, iron, and B-vitamin content directly supports established prenatal nutritional requirements.
Zinc is critical for cell division, immune function, and fetal growth; deficiency is associated with intrauterine growth restriction, preterm birth, and congenital malformations. NIH ODS lists zinc among nutrients with critical prenatal roles that are underconsumed. A Cochrane systematic review of zinc supplementation in pregnancy found significant reductions in preterm birth (RR 0.86). RDA increases to 11 mg/day during pregnancy.
Colostrum (first milk after delivery) has been used traditionally across cultures to support neonatal immune function and gut health in the immediate postnatal period. Bovine colostrum supplementation during pregnancy has been studied in small trials for supporting maternal immune function and gut integrity, though evidence is limited and insufficient for specific prenatal health recommendations beyond its postnatal neonatal use.
Eucommia bark is documented in the Chinese Pharmacopoeia specifically for 'calming the fetus' and preventing threatened miscarriage and pregnancy bleeding. It is a classical TCM herb for pregnancy support, with uterine-stabilizing properties attributed to it for over 2,000 years. Scientific studies on this indication are absent.
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