Cucumber

Cucumber (Cucumis sativus L.): A Comprehensive Reference

1. Identity, Taxonomy, and Botanical Description

Cucumis sativus L. is a member of the Cucurbitaceae family, along with melon, squash, and pumpkins. The cucumber is a widely cultivated plant in the gourd family Cucurbitaceae; cucumbers originated in India and have been cultivated for at least 3,000 years in Western Asia, and were probably introduced to other parts of Europe by the Romans. Records of cucumber cultivation appear in France in the 9th century, England in the 14th century, and in North America by the mid-16th century.

Commercially, production of cucumbers is usually divided into two types: "slicing cucumbers," produced for fresh consumption, and "pickling cucumbers," produced for eventual processing into pickles. Slicing cucumbers are usually larger and have thicker skins, while pickling cucumbers are usually smaller and have thinner skins. There are three main varieties of cucumber: slicing, pickling, and seedless.

The most popular variety is the long smooth salad cucumber, which has a smooth, dark-green skin. The true gherkin is a different species (Cucumis anguria), widely grown in the West Indies.

Common Names

• English: Cucumber
• Sanskrit (Ayurveda): Trapusha, Sushitalam (meaning "very cooling")
• Persian (Traditional Medicine): Tokhm-e-khiyar (seeds)
• Botanical authority: Cucumis sativus L. (Linnaeus)

Common Preparations and Forms

• Fresh fruit (raw, sliced, juiced)
• Pickled/fermented fruit (brine cucumbers)
• Lyophilized (freeze-dried) fruit juice extract
• Aqueous, hydroalcoholic, and standardized extracts (used in research and cosmetics)
• Seed oil (cold-pressed, used in cosmetics and as a supplement)
• Seed powder/extract (used in clinical supplement research)
• Topical preparations: creams, face masks, and cosmetic formulations containing fruit extract

Cucumis sativus (Cucumber) Fruit Extract is reported to be manufactured by extracting cucumber fruit in mixtures of glycerin and water, water and butylene glycol, or water and propylene glycol. The fresh fruit is extracted peeled or unpeeled. Many, if not most, traditional cucumber herbal therapies were water extracts (often steeped beverages), and not alcoholic extracts; therefore, aqueous extracts are being increasingly studied to understand and isolate the constituents providing health benefits.

2. Nutritional and Chemical Composition

Proximate Composition

Cucumber fruit is composed mostly of water; more than 96% of the edible unpeeled fruit is water. Other constituents of C. sativus L., according to one source, are vitamins, minerals, amino acids, phytosterols, phenolic acids, fatty acids, and cucurbitacins. According to another source, traces of essential oil, amino acids, pectins, starch, sugars, vitamin C, and cucurbitacins are found in cucumbers. Glycosides, steroids, flavonoids, carbohydrates, terpenoids, and tannins were identified in an aqueous extract of the cucumber fruit.

Cucumbers (Cucumis sativus L.) are low-calorie fruits that are mostly water, making them a hydrating food choice. They contain small but important amounts of proteins, carbohydrates, and dietary fiber, as well as very low fat content. The nutritional composition can vary depending on the region where cucumbers are grown, but generally they are a good source of vitamins and minerals such as potassium, magnesium, manganese, calcium, copper, sodium, and zinc.

Vitamins present in cucumbers include vitamin K, vitamin C, and vitamin A, all of which contribute to their health benefits. According to the United States Department of Agriculture (USDA), 100 grams of unpeeled, raw cucumber provides 24 micrograms (mcg) of vitamin K. Cucumber skin is full of beta-carotene, which is part of the reason for its rich green color. The carotene family of pigments are important provitamins; the body can convert beta-carotenes into Vitamin A, which is a critical vitamin for keeping eyes and skin healthy.

Key Phytochemical Classes

Studies have shown that cucumbers contain lignans, vitamin K, cucurbitacins and their derivatives (triterpenoids), flavonoids (apigenin, luteolin, quercetin, and kaempferol), antioxidants (beta carotene and vitamin C), and B vitamins among other trace elements and minerals.

Primary categories of phytonutrients found in cucumbers include: flavonoids (apigenin, diosmetin, fisetin, luteolin, quercetin, kaempferol, luteolin, naringenin); lignans (pinoresinol, lariciresinol, secoisolariciresinol); and triterpenes (cucurbitacin A, cucurbitacin B, cucurbitacin C, cucurbitacin D).

Several bioactive compounds have been isolated from cucumber including cucurbitacins, cucumegastigmanes I and II, cucumerin A and B, vitexin, and orientin.

Cucurbitacins (Triterpenoids)

Cucurbitacins are a compelling class of drug leads, primarily present in the plant kingdom, especially in the Cucurbitaceae family; however, these natural compounds are also known in several genera within other plant families. The well-known vegetable Cucumis sativus (cucumber) is rich in cucurbitacins A, B, C, D, and E. Bitter principles — cucurbitacins (Cts) — are the characteristic properties of this species.

Phytosterols

One source reports the following phytosterols in cucumber fruit: 3,800 µg β-sitosterol/100 g edible portion, 200 µg campesterol/100 g edible portion, 2,900 µg stigmasterol/100 g edible portion, 300 µg β-sitostanol/100 g edible portion, and 100 µg campestanol/100 g edible portion.

Lignans and Phytoestrogens

Lignans present include secoisolariciresinol and matairesinol; isoflavones including daidzein, genistein, glycitein, biochanin A, and formononetin, as well as coumestrol, comprise less than 1 µg/100 g wet weight of the fruit. Liquid chromatography–mass spectrometry that incorporated 13C3-labeled standards determined that cucumber contained 12 to 13 µg phytoestrogens/100 g wet weight.

Seed Oil Fatty Acid Profile

Cucumis sativus seed oil is 9–13% palmitic acid, 6–9% stearic acid, 14–20% oleic acid, and 60–68% linoleic acid.

Fisetin Content

Fisetin occurs in numerous fruits and vegetables, such as grapes, apples, onions, strawberries, and cucumbers. It is found in the range of 2–160 µg/g in different food plants, and the average daily intake of this flavonol in humans has been estimated at about 0.4 mg.

3. Traditional and Historical Use

South Asian / Ayurvedic Traditions

Cucumis sativus is native to India and has been recognized for its economic value and therapeutic properties in traditional medicine, particularly in Ayurveda. The coolness of cucumber has been revered in Ayurveda since ancient times; indeed, one of the Sanskrit synonyms of cucumber is sushitalam — meaning "very cooling."

Cucumber is widely used in Ayurvedic treatment for difficulty in urination, excessive thirst, headache, and insomnia. The Sushruta Samhita, the Ayurvedic treatise, mentions that cucumber is a sheetala (coolant), mutraka (diuretic), and basti shodhana (cleanser of the urinary bladder).

In traditional Ayurvedic classification, the fruit is refrigerant, haemostatic, tonic, and useful in hyperdipsia and thermoplegia. The seeds are noted as having a cooling effect on the body and are used to prevent constipation.

Cucumber seeds receive special mention in Ayurvedic texts. Beyond being diuretic, they possess nourishing and cooling properties. When prepared properly, cucumber seeds are used to relieve internal heat, reduce phlegm in the lungs, and provide essential nutrients.

Ancient Civilizations: Egypt, Greece, Rome, and the Near East

Cucumber was very popular in the ancient civilizations of Egypt, Greece, and Rome, where it was used not only as a food but also for its skin healing properties. Cucumber is listed among the products of ancient Ur, and the legend of Gilgamesh describes people eating cucumbers.

Cucumbers and cucumber extracts have long been recognized as having anti-inflammatory properties, and have been used topically for various types of skin problems, including swelling under the eyes and sunburn.

Iranian / Persian Traditional Medicine

Seeds of C. sativus (Tokhm-e-khiyar in Persian) have been used as anti-fever, demulcent, and antidiabetic in Iranian Traditional Medicine.

Folk and Cross-Cultural Cosmetic Use

As folk medicines and folk cosmetics, cucumber pulp has been used to clean skin for centuries around the world. The fruits are sweet, refrigerant, haemostatic, and tonic. Traditionally, cucumber is used for the wide spectrum of cure in rural and urban areas to remove general debility and as a cooling agent. Usually cucumber fruits or seeds are used for the treatment of skin problems through the centuries.

Traditional Forms of Preparation

Across traditions, cucumber has historically been used as:

• Fresh fruit, eaten raw as a salad ingredient or standalone cooling food
• Fresh juice, applied topically or consumed internally
• Seeds, either eaten whole, ground, or steeped as a tea/decoction
• Fermented pickle preparations
• Topical pulp application directly to skin, eyes, or affected areas
• Water extracts (steeped beverages), which represent the most historically common preparation in herbal cucumber therapies across cultures.

4. Key Constituents and Proposed Mechanisms of Action

Cucurbitacins: Anti-Inflammatory and Anticancer Mechanisms

Cucurbitacins have diverse therapeutically important and attractive bioactivities, including in cancer chemoprevention/chemotherapy, and numerous preclinical studies have demonstrated these properties. Cucumber is rich in polyphenolics and cucurbitacins, which are known to possess multiple biological activities such as antioxidant, anti-carcinogenic, anti-hyaluronidase, anti-elastase, anti-inflammatory, anti-hyperglycemic, diuretic, amylolytic, antimicrobial, and analgesic effects.

Flavonoids: Antioxidant and Cytoprotective Effects

Fisetin (3,3′,4′,7-tetrahydroxy flavone) is a naturally occurring flavonoid found in cucumbers, among other fruits and vegetables, which shows strong anti-inflammatory, antioxidant, anticancer, anti-invasive, anti-angiogenic, antidiabetic, neuroprotective, and cardioprotective activity. As a hydrophobic agent, fisetin readily penetrates cell membranes and accumulates in cells to exert neuroprotective, neurotrophic, and antioxidant effects.

Lignans: Phytoestrogenic and Cancer-Protective Mechanisms

The results of cancer studies have shown that cucumber lignans such as lariciresinol, pinoresinol, and secoisolariciresinol are converted by intestinal bacteria into enterolignans (enterodiol and enterolactone), compounds associated in epidemiological research with modulation of estrogen receptor pathways and reduced risk for hormone-sensitive cancers.

Cucumber contains lariciresinol, pinoresinol, and secoisolariciresinol — three lignans that have a strong history of research in connection with reduced risk of several cancer types, including breast cancer and prostate cancer.

Anti-Hyaluronidase and Anti-Elastase Activity

A study of Cucumis sativus L. extract showed that the extract provided antioxidant properties via anti-hyaluronidase, anti-elastase, and reactive oxygen species (ROS) cleavage activity. These mechanisms are relevant to the slowing of skin aging and the preservation of connective tissue integrity.

Nutritional Mechanisms (Vitamins K, C, and Beta-Carotene)

Cucumis sativus L. contains a good amount of water with small fiber content; in addition, it provides a good source of vitamins A, K, and C, as well as a large amount of potassium. Vitamin K is essential for coagulation factor activity and bone mineralization, while vitamin C supports collagen synthesis and immune function.

5. Scientific Evidence by Area of Health Use

5.1 Lipid-Lowering / Cardiovascular Effects

The most rigorous human clinical evidence for cucumber's supplemental use concerns its effect on blood lipid profiles.

Human/Clinical evidence (randomized controlled trial): A randomized double-blind placebo-controlled clinical trial found that Cucumis seed extract resulted in significant reductions in total cholesterol (P = 0.016), LDL-C (P < 0.001), triglycerides (P < 0.001), and BMI (P < 0.001), as well as a significant increase in HDL-C (P = 0.012) compared to placebo. The authors concluded that consumption of C. sativus seed extract with a daily dose of 500 mg results in desirable effects on serum lipid profile in adult hyperlipidemic patients. The trial was completed by 24 patients in the Cucumis group and 23 patients in the placebo group.

Evidence strength: Moderate. This single RCT is suggestive but limited by its modest sample size. Replication in larger trials is needed.

5.2 Antidiabetic and Blood Glucose Effects

Cucumber has demonstrated potential antidiabetic activity in research settings.

Animal evidence: Two diabetic groups were treated with Cucumis sativus methanol extract and two with Cucurbita maxima extract, each at 200 and 400 mg/kg for 21 days after streptozotocin-induced diabetes. Another group was treated with both extracts at 200 mg/kg each, and another with metformin (200 mg/kg orally). The plant extracts normalized serum liver enzyme activities, oxidative stress markers, and restored serum proteins and lipid profile. They also significantly reduced blood sugar to values comparable to non-diabetic rats; the hypoglycemic effect was confirmed by improved immunohistochemical expression of insulin in β-cells of the islets of Langerhans.

Conflicting/null evidence (animal): In another investigation, none of the seed fractions were effective in causing hypoglycemia in normal groups even after prolonged treatment during the sub-acute phase of the study — there were no sulfonylurea-like effects detectable. These findings are in accordance with Chandrasekar et al., who investigated blood glucose lowering potential of eight plants of the Cucurbitaceae family including C. sativus fruit extract, revealing that the applied fruit ethanolic extract failed to lower blood sugar or depress the peak value after glucose load intake when administered as a single oral dose of 250 mg/kg to normal and hyperglycemic rats.

Evidence strength: Preliminary and inconsistent. Results are largely confined to animal (rodent) models using streptozotocin-induced diabetes, and outcomes are mixed depending on the extract type, dose, and species used. No adequately powered, placebo-controlled human trials specifically on cucumber's antidiabetic effect have been reported in the peer-reviewed literature.

5.3 Antioxidant Activity

The aim of one study was to screen the antioxidant, anti-hyaluronidase, and anti-elastase activity of the lyophilized juice of Cucumis sativus fruit (CSLJ). The CSLJ was subjected to DPPH and superoxide radical scavenging assay in reference to butylated hydroxytoluene. The CSLJ exhibited DPPH-free radical and superoxide radical scavenging activity, with IC50 at a concentration of 14.73 ± 1.42 and 35.29 ± 1.30 µg/mL, respectively.

Evidence strength: In vitro only. These are cell-free or cell-based laboratory assays; their clinical relevance in humans has not been established through clinical trials.

5.4 Skin Health, Anti-Aging, and Dermatological Applications

One study was designed to screen the anti-aging and anti-wrinkle potential of Cucumis sativus fruit through in vitro estimation of antioxidant, anti-hyaluronidase, anti-elastase, anti-collagenase/anti-matrix metalloproteinase (MMP)-1, and anti-tyrosinase activity. The CSLJ showed strong anti-hyaluronidase (P < 0.001) and anti-elastase (P < 0.001) activity, with IC50 at a concentration of 20.98 ± 1.78 and 6.14 ± 1.74 µg/mL, respectively.

Several pharmacological activities including the antioxidant, antiwrinkle, antimicrobial, antidiabetic, and hypolipidemic potentials have been reported with this plant. Anti-hyaluronidase and anti-elastase activities have been proved for its cosmetic potentials.

Cucumber contains antioxidants such as ascorbic acid and flavonoids, for example quercetin, apigenin, luteolin, and kaempferol, which are all found to be good for healthy skin.

Evidence strength: In vitro laboratory evidence only. Anti-hyaluronidase and anti-elastase data are promising for cosmeceutical applications but no double-blind, placebo-controlled human clinical trials on cucumber-specific topical formulations were identified in the peer-reviewed literature. Regulatory bodies such as the CIR Expert Panel have, however, assessed cucumber-derived cosmetic ingredients.

5.5 Cosmetic Safety Assessment

The Cosmetic Ingredient Review (CIR) Expert Panel assessed the safety of 6 Cucumis sativus (cucumber)-derived ingredients and found them safe in cosmetic formulations in the present practices of use and concentration. These ingredients are reported to function in cosmetics as skin-conditioning agents. Cucumber is a commonly consumed food with no history of significant adverse effects, suggesting that its ingredients should not pose any major safety issues following oral exposure.

5.6 Anticancer Activity

Research in this area has focused primarily on cucurbitacins and fisetin, as well as on whole-extract effects against specific cancer cell lines.

Cucurbitacins: Cucurbitacins present in C. sativus have exhibited cytotoxicity and anti-cancer activity in laboratory studies.

Fisetin (preclinical/cell line evidence): Fisetin, a natural flavonoid present in cucumber, exhibits a range of biological effects in cancer research, such as suppressing cell growth, triggering programmed cell death, reducing the formation of new blood vessels, protecting against oxidative stress, and inhibiting cell migration. The anticancer properties of fisetin can be attributed to a diverse array of molecules and signaling pathways, including vascular endothelial growth factor (VEGF), mitogen-activated protein kinase (MAPK), nuclear factor-kappa B (NF-κB), PI3K/Akt/mTOR, and Nrf2/HO-1.

Preclinical trials have demonstrated that fisetin inhibits cancer cell growth through mechanisms such as cell cycle alteration, induction of apoptosis, and activation of the autophagy signaling pathway.

Aqueous extract (in vitro): Methanolic and acetone extracts of Cucumis sativus (CSME and CSAE) were evaluated for anticancer potential. Reported results showed that CSME, rich in bioactive compounds, showed anticancer activity against MCF-7 cell lines with an IC50 of 15.6 ± 1.3 and HeLa cells at 28.2 ± 1.

Evidence strength: Preliminary, predominantly in vitro and animal model data. No human clinical trials specifically on cucumber or isolated cucurbitacins for cancer treatment or prevention have been identified. Fisetin research, while extensive in cell culture and animal models, has not translated into established clinical protocols.

5.7 Antimicrobial Activity

Cucumber constituents have demonstrated antimicrobial effects in laboratory contexts, among their multiple biological activities. Documented pharmacological actions of Cucumis sativus include antimicrobial activity, among others.

Evidence strength: In vitro only; no human clinical evidence for antimicrobial applications.

5.8 Hepatoprotective and Renal Effects

Pharmacological actions documented for Cucumis sativus include hepatoprotective and gastroprotective effects in experimental studies. Animal studies on streptozotocin-induced diabetic rats demonstrated that Cucumis sativus extracts normalized serum liver enzyme activities, which serve as markers of hepatic damage. These findings are preclinical in nature.

5.9 Anti-Inflammatory Effects

Research has examined the antioxidant and anti-inflammatory characteristics of Cucumis sativus extract. A combination of citrus, cucumber, and glycerol extract was found to serve as an effective alternative to synthetic antioxidants and anti-inflammatory drugs in vitro.

Evidence strength: In vitro. The anti-inflammatory potential of cucumber constituents such as cucurbitacins has been modeled in cell-based systems; clinical evidence in humans is lacking.

5.10 Neuroprotection (via Fisetin)

Fisetin has various pharmacological potentials including neuroprotective effects and has been studied in the context of vascular dementia. Fisetin has recently gained attention in biomedical research for its potent effects toward senescent cells, which are resistant to apoptosis and may be involved in physiological aging, as well as many pathological conditions.

Evidence strength: Preclinical. Fisetin's neuroprotective mechanisms have been characterized primarily in cell and animal models. Human clinical trials on fisetin for neurological conditions are an area of active investigation but are not yet conclusive.

6. Body Systems and Health Areas Associated with Cucumber

• Integumentary system (skin): Topical anti-inflammatory and skin-conditioning; anti-hyaluronidase and anti-elastase activity in vitro; historical and contemporary use for sunburn relief and periorbital swelling.
• Cardiovascular system: Lipid-lowering effect of seed extract demonstrated in one RCT; phytosterol content may contribute to cholesterol modulation.
• Urinary system: Diuretic properties documented in Ayurvedic tradition and supported by the high water and potassium content; traditional use for urinary calculi and dysuria.
• Metabolic / endocrine system: Potential antidiabetic and anti-hyperglycemic activity in animal models; human evidence is insufficient.
• Gastrointestinal system: Traditional use for constipation relief; high water and fiber content supports bowel regularity.
• Immune / oncological: In vitro and preclinical evidence for anticancer activity of cucurbitacins, fisetin, and lignans; no human trials.
• Nervous system: Preclinical neuroprotective evidence for fisetin; no established clinical application.
• Musculoskeletal system: Vitamin K content relevant to bone mineralization; lignan-derived enterolactone linked epidemiologically to bone health.

7. Dosage Forms and Dosages Reported in Studies

The following dosages are reported as stated in the published literature and do not represent recommendations:

• Seed extract (oral, capsule), clinical RCT: A daily dose of 500 mg of C. sativus seed extract was used in a clinical trial demonstrating effects on serum lipid profile in adult hyperlipidemic patients.
• Fruit methanol extract (animal, antidiabetic): Doses of 200 and 400 mg/kg body weight for 21 days were used in streptozotocin-induced diabetic rat models.
• Standardized aqueous extract (Q-Actin, safety study): A single dose of Q-Actin was well tolerated without mortality at 2,000 mg/kg body weight in Sprague Dawley rats. Oral (gavage) administration of Q-Actin up to 1,000 mg/kg bw/day was well tolerated followed by repeated administration for a maximum period of 90 days in Sprague-Dawley rats.
• Lyophilized fruit juice (CSLJ, in vitro): The CSLJ exhibited radical scavenging activity with IC50 at a concentration of 14.73 ± 1.42 µg/mL (DPPH) and 35.29 ± 1.30 µg/mL (superoxide), respectively.
• Anti-inflammatory (leaf extract, animal): The C. sativus leaves extract was assessed for anti-inflammatory activity in the Long Evans rat model at two doses (150 and 250 mg/kg bw), compared to indomethacin (10 mg/kg bw) as standard.
• Ethanolic fruit extract (single-dose, animal): The ethanolic fruit extract failed to lower blood sugar when administered as a single oral dose of 250 mg/kg to normal and hyperglycemic rats.

For topical cosmetic preparations, the CIR Expert Panel assessed cucumber-derived ingredients at concentrations used in marketed cosmetic formulations, which vary widely across product types.

8. Safety Considerations and Interactions

General Safety (Food Use)

According to the Food and Drug Administration (FDA), cucumbers are one of the 20 most frequently consumed raw vegetables. The fact that cucumbers are a commonly consumed food suggests that these ingredients pose no significant safety issue following oral exposure.

Toxicology of Standardized Extracts

The mutagenicity of a standardized aqueous cucumber extract (Q-Actin), as evaluated by Ames assay, in vitro chromosomal aberration test, and in vivo micronucleus assay, did not reveal any potential to induce genotoxicity. The results showed that Q-Actin is well tolerated in general toxicity studies and did not induce mutagenicity. The no-observed-adverse-effect level (NOAEL) of the standardized aqueous cucumber extract (Q-Actin) is considered to be ≥1,000 mg/kg bw/day, followed by repeated administration for 90 days.

Cucurbitacin-Related Gastrointestinal Effects

Cucurbitacin is a naturally occurring chemical in cucumbers and related plants. It may be health-promoting but may also cause burping and gassiness in some people. "Burpless" varieties of cucumbers, cucumber seeds, and cucumber plants are an alternative. Cucumbers also contain fiber and natural chemicals such as cucurbitacin, which may contribute to bloating or digestive upset, especially if one has an existing sensitivity or digestive issues.

Oral Allergy Syndrome (OAS) and Cross-Reactivity

Various adverse reactions, including latex-fruit syndrome, oral allergy syndrome, and anaphylaxis, have been linked to cucumber. Oral allergy syndrome symptoms to cucumber can be described by people allergic to ragweed pollen. This is a cross-reactivity of proteins to the ragweed pollen, not a true cucumber allergy.

People who are allergic to latex may also experience reactions to cucumbers because of their similar protein compositions. Bananas, kiwis, chestnuts, and papaya are additional foods in this group. Of those with latex allergies, 30–50% experience these reactions.

Cucumber allergy is mainly described in the context of health problems in greenhouse workers. People doing such work have to reckon with exposure to high concentrations of allergens in enclosed spaces.

Salicylate Sensitivity

Many foods contain salicylates. These are generally anti-inflammatory and good for the body; however, some people are sensitive to salicylates and have adverse reactions after eating foods high in salicylates. Cucumbers contain salicylates.

Vitamin K and Anticoagulant Interactions

Cucumber is a notable dietary source of vitamin K (100 g of unpeeled, raw cucumber provides 24 µg of vitamin K according to USDA data). Individuals on vitamin K-dependent anticoagulant therapy (e.g., warfarin) should be consistent in their cucumber and other vitamin K-rich vegetable intake, as significant changes in dietary vitamin K can alter anticoagulant efficacy. This is a general pharmacokinetic consideration applicable to all dietary vitamin K sources.

Cosmetic Safety

The CIR Expert Panel assessed the safety of 6 Cucumis sativus (cucumber)-derived ingredients and found them safe in cosmetic formulations in the present practices of use and concentration. This assessment focused on dermal exposure to the low concentrations of these ingredients as used in cosmetics.

References

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