Rubus

Other Names

Allegheny blackberryAmerican red raspberryAndean blackberryArctic raspberryBlack raspberryBlackberryBlue raspberryBokbunjaBoysenberryBrambleBramble fruitBramblesBrierBriersBristleberryCanadian blackberryCane berryCane fruitCaneberryCha Tian PaoChinese raspberryCloudberryCommon blackberryCreeping raspberryCutleaf blackberryCutleaf evergreen blackberryDewberryEuropean blackberryEuropean dewberryEuropean red raspberryFlowering raspberryFu-Pen-ZiFupenziGarden dewberryHildaberryHimalayan blackberryHoly brambleHybrid berryIdaean brambleJapanese blackberryJapanese wineberryKorean black raspberryKorean blackberryKorean brambleLoganberryMarionberryMora-brancaMora-do-matoMountain blackberryMountain raspberryMysore raspberryNorthern dewberryOlallieberryPennsylvania blackberryPurple raspberryPurple-flowering raspberryRaspberryRed raspberryRubus allegheniensisRubus arcticusRubus armeniacusRubus caesiusRubus canadensisRubus chamaemorusRubus chingiiRubus cockburnianusRubus coreanusRubus crataegifoliusRubus ellipticusRubus flagellarisRubus fruticosusRubus glaucusRubus idaeusRubus L.Rubus laciniatusRubus leucodermisRubus niveusRubus occidentalisRubus odoratusRubus parviflorusRubus parvifoliusRubus phoenicolasiusRubus sanctusRubus saxatilisRubus spectabilisRubus strigosusRubus trivialisRubus ulmifoliusRubus ursinusRubus x loganobaccusSalmonberrySand blackberrySilvanberrySnow raspberrySouthern dewberryStone brambleSwamp dewberryTayberryThimbleberryThornless blackberryTrailing blackberryTummelberryVeitchberryWestern blackberryWestern raspberryWhitebark raspberryWineberryYellow raspberryYoungberry

Synopsis

Rubus: A Comprehensive Reference

1. Identity: Botanical Classification, Natural Sources, and Common Forms

1.1 Taxonomy and Botanical Description

Rubus L. (Rosaceae, Rosoideae) contains around 700 species distributed on all continents except Antarctica, with the highest species diversity in temperate to subtropical regions of the northern hemisphere. It is a large and diverse genus of flowering plants in the rose family, Rosaceae, subfamily Rosoideae. Raspberries, blackberries, and dewberries are common, widely distributed members of the genus. Most of these plants have woody stems with prickles like roses; spines, bristles, and gland-tipped hairs are also common in the genus. The Rubus fruit, sometimes called a bramble fruit, is an aggregate of drupelets.

The taxonomy of Rubus has historically been difficult due to morphological diversity and overlapping characteristics, apomixis, polyploidization and hybridization. Morphologically, the species of Rubus exhibit tremendous diversity, with plants ranging from woody to semi-woody, trailing, erect or climbing shrubs or subshrubs to perennial creeping dwarf herbs. The leaves range from simple to palmately or pinnately compound with 3–11(–15) leaflets. Rubus has a basic chromosome number of seven, and ploidy levels ranging from diploid to tetradecaploid (or octadecaploid).

The genus Rubus was formally established by Carl Linnaeus in his 1753 publication Species Plantarum, where he placed it within the family Rosaceae and described 13 species, mainly drawing from European specimens such as R. idaeus (red raspberry) and R. fruticosus (common blackberry).

1.2 Medically and Nutritionally Significant Species

Several species within the genus are of particular pharmacological relevance:

Rubus idaeus L. — Red raspberry (European/Eurasian). A shrub that grows wild in temperate countries. This is the species most extensively studied in phytomedicine and to which most regulatory assessments apply.
Rubus fruticosus L. — Common blackberry. A shrub famous for its fruit, the blackberry.
Rubus chingii Hu — Chinese raspberry ("Fu-Pen-Zi"). This species has great medicinal and dietary value since ancient times. The dried fruits have been widely used in traditional Chinese medicine (TCM) for the treatment of kidney enuresis and urinary frequency for centuries.
Rubus coreanus Miquel — Korean black raspberry. A unripe fruit of black raspberry native to eastern Asia, used as traditional oriental medicine and supplementary food for centuries.
Rubus occidentalis L. — Black raspberry (North American).

1.3 Plant Parts Used and Common Preparations

Syrups, jams and other preserves are prepared from the fruit. The cooked root is also used as food, while leaves, whether dried or fresh, are used as a tea. The young shoots are used in salads after peeling.

Raspberry leaf is the common name for the leaf of the plant Rubus idaeus L. The HMPC (European Medicines Agency's Committee on Herbal Medicinal Products) conclusions cover raspberry leaf preparations which are obtained by drying and comminuting (reducing into tiny pieces) the leaves and as dry extracts. Dry extracts are obtained by putting the plant material in a solvent to dissolve compounds and form a liquid extract.

The herbal substance consists of the dried leaf of Rubus idaeus L. (Fam. Rosaceae). It is described in the French Pharmacopoeia (XI edition, 2012): it consists of the compound leaf or leaflet of Rubus sp. and contains a minimum of 5% tannins. The British Herbal Pharmacopoeia also describes the herbal substance: "Rubus consists of the dried chopped leaves of Rubus idaeus L. (Fam. Rosaceae) which is a small shrub that is grown in most temperate countries."

A monograph on Raspberry Leaf (ref. 2950) was newly included in the European Pharmacopoeia (Ph.Eur., 2020). The content is expressed in tannins expressed as pyrogallol (minimum 3%).

Commercially available preparations include dried leaf for herbal infusion/tea, standardized dry extracts in capsule or tablet form, tinctures, and standardized liquid extracts.

2. Traditional and Historical Use

2.1 Ancient and Classical Antiquity

The genus Rubus L., indigenous to six continents, includes blackberries, raspberries, and their hybrids and is commonly referred to as brambles or briers. Rubus species were a food and medicinal source for native peoples soon after the Ice Age. Brambles were documented in the writings of the ancient Greeks: Aeschylus, Hippocrates, Krataeus, Dioscorides, and Galen; Romans: Cato, Ovid, and Pliny the Elder; Asian medicinal traditions; traditional Chinese medicine; and the Ayurvedic tradition of India. Folk traditions of native peoples throughout the world have also applied Rubus for multiple medicinal uses.

The stems and leaves of Rubus species were immersed into white wine for use as an astringent poultice for wound healing and for difficulties during childbirth, as suggested by Hippocrates.

2.2 Traditional Chinese Medicine (TCM)

The Shen Nung Ben Tsao (25–220 CE), the Herbal Classic, is the oldest book on oriental herbal medicine. Among the herbal remedies described is Fupenzi, which is commonly composed of fruits of Rubus idaeus, one of the Chinese raspberry species. Fupenzi means "upside-down bowl," which may refer to the shape of an overturned raspberry fruit, or an overturned chamber pot, because of the plant's enuretic effects. In traditional Chinese medicine, Chinese raspberries are considered to have sweet and warm properties, which are associated with the liver and kidney meridians. They function to tonify and stabilize the kidneys to preserve vital energy and treat cases of liver and kidney deficiency.

2.3 European Folk and Herbal Medicine

Rubus L. is one of the most species-rich genera in the Rosaceae family, though only a few species have been used as medicinal herbs. Ethnomedicinal uses of Rubus idaeus can be found in many cultures. Indigenous folk medicine from native peoples of Oceania, Africa, and America includes Rubus, which is naturally distributed on six of the seven continents.

Both berries and green leaves or young shoots of the plant have traditionally been used in folk medicine to treat common cold, fever, or ailments of the gastrointestinal tract, to relieve menstrual cramps and to stimulate labor. Although Rubus species are most commonly known as food products, they are a popular anti-inflammatory and antimicrobial remedy used in traditional medicine in eastern parts of Europe. The most common herbal drug in folk medicine is the fruit, though the shoots of R. idaeus have also been used to treat common cold, fever and flu-like infections.

2.4 Traditional Uses in North America and Oceania

In Australia, aboriginal people used a decoction of raspberry leaves as a traditional treatment for diarrhea. Various indigenous peoples across North America also documented uses of the raspberry plant. The blossom was used to make an eye ointment or a stomach draught. The roots were crushed and used as an astringent or made into a tea for dysentery. Some roots were used as a cough remedy by chewing. Raspberry tea was used for relief of uterine contractions during childbirth. Raspberry leaf tea was used to wash and clean old sores.

2.5 Women's Health and Parturition

Raspberry leaf is very commonly taken as a tea during the later stages of pregnancy, as it is reputed to facilitate labour. It is also used for the relief of menstrual cramps, for its astringent properties in diarrhoea and disorders of the gastrointestinal tract, as a mouthwash for inflammation of the mouth and throat, and as an eye lotion for conjunctivitis.

Various blackberry plants are useful in the treatment of cancer, dysentery, diarrhea, whooping cough, colitis, toothache, anemia, psoriasis, sore throat, mouth ulcer, mouthwash, hemorrhoids, and minor bleeding.

3. Key Constituents and Active Compounds

3.1 Polyphenols: Ellagitannins

The raspberry fruit contains a number of phenolic compounds, the predominant being anthocyanins and ellagitannins, accompanied by significantly lower concentrations of flavonoids, phenolic acids and flavan-3-ols. Ellagitannins are a group of hydrolysable tannins distinctive for the family Rosaceae.

The chemical composition of Rubus idaeus leaf extracts includes polyphenols, specifically ellagitannins and flavonoids. Ellagitannins, which include ellagic acid and sanguiin H-6, are potent antioxidants that shield cells from harm by free radicals.

Key ellagitannins include lambertianin C and sanguiin H-6. The ellagitannin preparation is obtained by extracting raspberry press cake and purifying the extract using Amberlite XAD resin.

3.2 Flavonoids

Flavonoids, such as quercetin, kaempferol, and myricetin, possess antioxidant characteristics and have been associated with several health benefits, including anti-inflammatory and anti-cancer qualities.

Polyphenolic compounds discovered in Rubus include mainly hydrolyzable tannins (2.6% to 6.9%), including gallotannins, which are esters of gallic acid and D-glucose. Dimeric and tetrameric ellagitannins have also been identified, as well as flavonoids, such as kaempferol, kaempferol hexosides, quercetin, and quercetin glycosides, and phenolic acids, such as chlorogenic, gallic, ferulic, and caffeic acids. In addition, terpenes, such as oxygenated monoterpenes, 1,8-cineole, α-terpineol, terpinyl acetate, and camphor; carotenoids; vitamins C and E; and minerals, such as calcium, magnesium, and zinc, have been identified.

3.3 Anthocyanins

Anthocyanins and ellagitannins are known to provide a major antioxidant capacity in raspberries. Anthocyanins are primarily concentrated in the colored fruit tissue and are responsible for the characteristic red, purple, or black pigmentation of different Rubus species' fruits.

3.4 Total Phytochemical Profile of R. idaeus

Approximately 194 compounds have been isolated from Rubus idaeus, which is rich in phenols, terpenoids, alkaloids, steroids, and fatty acids.

Across the genus, Rubus species contain vitamins, steroids and lipids in seed oil and minerals, flavonoids, glycosides, terpenes, acids and tannins in aerial parts, which possess diverse pharmacological activities such as antioxidant, anti-carcinogenic, anti-inflammatory, antimicrobial, anti-diabetic, anti-diarrheal, and antiviral properties.

Blackberry plants (R. fruticosus) contain tannins, gallic acid, villosin, and iron; the fruit contains vitamin C, niacin (nicotinic acid), pectin, sugars, and anthocyanins; berries also contain albumin, citric acid, malic acid, and pectin.

3.5 Ellagic Acid and Urolithins

The bioavailability of ellagic acid (EA) is relatively low, with the concentration of EA ultimately distributed in tissues and blood often lower than the effective concentration for biological effect. Some unabsorbed EA is metabolized into more easily absorbed urolithins under the action of gastrointestinal flora. The colonic microbiota metabolite of EA, urolithins, has emerged as a novel class of natural bioactive compounds attracting investigation both as nutraceuticals and as pharmacological compounds.

3.6 Tannin Content and Astringency

Extracts of raspberry leaves contain higher total phenolic content (TPC) (1290 mg/L, expressed in gallic acid equivalent) compared to that in extracts of stems or peeled bark (up to 420 mg/L and 598 mg/L, respectively). The tannin content is explicitly quantified in pharmacopoeial standards: the European Pharmacopoeia 2020 monograph requires a minimum of 3% tannins expressed as pyrogallol in raspberry leaf drug.

4. Mechanisms of Action

4.1 Antioxidant Activity

Raspberries (Rubus idaeus) possess a wide phenolic family profile. Interest in these compounds has significantly increased since they have been classified as nutraceuticals due to positive health effects. Extensive chemical, in vitro and in vivo studies have been performed to validate their benefits and possible applications when treating several chronic degenerative diseases characterized by oxidative stress and an inflammatory response.

Antioxidant properties have been evaluated with three complementary assays: DPPH radical scavenging activity, chelating Fe(II) power, and ferric reducing power. The highest antioxidant activity was determined for crude extracts from raspberry pulp. Anti-inflammatory activity was demonstrated by inhibitory effects on lipoxygenase (LOX) and cyclooxygenase-2 (COX-2) activity in vitro, with the highest efficiency in inhibiting both enzymes exhibited by the crude extract.

4.2 Anti-inflammatory Mechanisms

R. chingii has been reported to contain a variety of chemical constituents, mostly triterpenoids, diterpenoids, flavonoids, and organic acids. These compounds have been demonstrated to be the major bioactive components responsible for pharmacological effects such as anticomplementary, anticancer, antioxidant, antimicrobial, and anti-inflammatory functions.

4.3 Uterine Smooth Muscle Effects

Raspberry leaf has been shown to have biophysical effects on animal and human smooth muscle, including the uterus. Early research published in the Lancet in 1941 (Burn and Withell) identified a principle in raspberry leaves that relaxes uterine muscle; later pharmacological work demonstrated both contractile and relaxant effects depending on experimental conditions and dose, making the precise mechanism of action on uterine tissue complex and still insufficiently characterized.

4.4 Cholesterol and Lipid Metabolism (AMPK Pathway)

Ellagic acid, a major bioactive compound in Rubus coreanus, was hypothesized to decrease cellular and plasma cholesterol levels. Investigation in hepatocytes and a high-cholesterol diet (HCD)-induced rat model showed that cholesterol in the liver and serum was significantly reduced. The hepatic activities of HMG-CoA and CETP were reduced, and the hepatic activity of LCAT was increased by both Rubus coreanus extract and ellagic acid. The MDA content in the aorta and serum was significantly decreased after oral administration. AMPK phosphorylation in the liver was induced by the extract and ellagic acid, which activated AMPK, inhibiting the activity of HMGCR by inhibitory phosphorylation. These mechanisms are demonstrated in preclinical models only; no clinical confirmation in humans exists for this specific pathway as of the time of writing.

4.5 Anti-adipogenic and Antiobesity Mechanisms

Bioactive compounds isolated from Rubus coreanus, including ellagic acid, decreased lipid accumulation in 3T3-L1 adipocyte cells and the mRNA expression levels of key adipogenic genes such as PPARγ, C/EBPα, SREBP-1c, ACC, and FAS. Again, these findings are from cell-culture models and require confirmation in human studies.

5. Scientific Evidence by Area of Use

5.1 Labor Support and Obstetric Outcomes

This is the area for which the most clinical data exist, though the quality remains limited.

Because of the paucity of research regarding this herb, particularly in relation to pregnancy and birth, a double-blind, randomized, placebo-controlled trial was conducted. The sample consisted of 192 low-risk, nulliparous women who birthed their babies between May 1999 and February 2000 at a large tertiary-level hospital in Sydney, Australia. The aim was to identify the effect and safety of raspberry leaf tablets (2 × 1.2 g per day), consumed from 32 weeks' gestation until labor, on labor and birth outcomes. Raspberry leaf, consumed in tablet form, was found to cause no adverse effects for mother or baby, but contrary to popular belief, did not shorten the first stage of labor. The only clinically significant findings were a shortening of the second stage of labor (mean difference = 9.59 minutes) and a lower rate of forceps deliveries between the treatment group and the control group (19.3% vs. the control rate).

A 2024 prospective observational study further examined this area: A total of 91 completed records were obtained, 44 exposed to raspberry leaf and 47 not exposed. A smaller proportion of women in the raspberry leaf cohort had augmentation of labour, epidural anaesthesia, instrumental births, caesarean section, and postpartum haemorrhage. A larger proportion had vaginal birth and all phases of labour were shorter. Under these conditions the use of raspberry leaf was strongly predictive of women not having their labours medically augmented.

However, the limitations of this observational evidence are significant: While the study demonstrated that raspberry leaf was strongly predictive of women not having their labours medically augmented, the results cannot be relied on or generalised to the wider population of pregnant women. While there were no safety concerns observed in that study, this should not be taken as evidence that raspberry leaf is safe. A randomised controlled trial is urgently needed to provide women and healthcare providers with robust evidence on which to base practice.

The systematic review picture is equally cautious: 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. 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.

The European Medicines Agency concluded that raspberry leaf preparations are generally recognised as safe, but that the evidence regarding efficacy is weak and the identification of the active constituents is lacking. The EMA also stated that results from in vivo and in vitro studies are variable and do not offer strong evidence to support the proposed reasons for giving this supplement. The available clinical studies do not meet the criteria for "well-established medicinal use," and the treatment should not be recommended for use during pregnancy.

Evidence strength: Weak. There is one small RCT and several observational studies. Clinical benefit in terms of labor outcomes is marginal and not statistically consistent; no adequately powered, well-controlled RCT confirms efficacy.

5.2 Dysmenorrhea (Painful Menstrual Cramps) and Gynecological Uses

The HMPC conclusions on the use of raspberry leaf medicines for relief of period spasms, mouth or throat inflammation, and diarrhea are based on their "traditional use." This means that although there is insufficient evidence from clinical trials, the effectiveness of these herbal medicines is plausible and there is evidence that they have been used safely in this way for at least 30 years (including at least 15 years within the EU). Moreover, the intended use does not require medical supervision.

The HMPC noted the lack of clinical studies with raspberry leaf medicines for these uses. Data from laboratory studies were also very limited. The HMPC conclusions are therefore based on the long-standing use of these medicines.

A recent phase II double-blind randomized controlled trial examined Rubus idaeus leaf extract in a different pain context — knee osteoarthritis: Participants were randomized equally to receive one daily capsule during 3 months of either Rubus idaeus leaf extract 400 mg, Rubus idaeus leaf extract 200 mg, or placebo. The primary endpoint was an absolute change of the WOMAC pain subscale. In the intention-to-treat population, WOMAC pain was not significantly modified by Rubus idaeus leaf extract compared to placebo. However, Rubus idaeus leaf extract 400 mg after 12 weeks of treatment significantly reduced pain measured by VAS. The mean pain decrease was over −7 mm, which is clinically relevant and reached statistical difference compared to placebo with the highest dose. Rubus idaeus was not significantly more efficient than placebo on WOMAC global score, stiffness, physical function subscores, or other secondary measures. Rubus idaeus leaf extract was well tolerated and effective to relieve pain in a patient with knee osteoarthritis.

Evidence strength (OA pain): Preliminary/Moderate. One Phase II RCT (NCT03703024) showing significant pain reduction by VAS at 400 mg/day, though the primary outcome was not met.

5.3 Antioxidant Activity and Chronic Disease Risk

Antioxidant, anti-inflammatory, antihypertensive, vasorelaxation, neuroprotective, and antimicrobial activities have been determined for raspberry fruit. Its potential in modulating the risk of metabolic diseases, especially cardiovascular disease, diabetes, obesity, and Alzheimer's disease — all of which have critical metabolic, oxidative, and inflammatory connections — has been confirmed in preclinical models.

Raspberries have been proven, by multiple sources, to have a high antioxidant and anti-inflammatory activity that patients with chronic diseases may benefit from. However, the vast majority of this evidence derives from in vitro and animal studies. There are currently no large-scale human RCTs establishing clinical disease outcomes for Rubus supplementation in cardiovascular disease or neurodegeneration.

Evidence strength: Preliminary (largely preclinical). Antioxidant and anti-inflammatory effects are well-established in laboratory and animal models but have not been validated in adequately powered clinical trials for disease prevention or treatment.

5.4 Antidiabetic Activity

The incidence of diabetes mellitus has prompted the exploration of medicinal plants, particularly those within the Rubus genus. An exhaustive exploration of the literature revealed that Rubus chingii Hu, Rubus idaeus, Rubus ulmifolius, Rubus fruticosus, Rubus amabilis, and some other Rubus species exhibited noteworthy antidiabetic effects, each operating via distinct mechanisms.

In a systematic review, a number of studies were evaluated to explore blackberry's therapeutic applications and actions. In vitro and in vivo studies confirm antidiabetic and antihyperglycemic effects of blackberry leaf and its constituents.

A study by Gowd et al. (2018) demonstrated that gastrointestinal digestion (GID) and gut microbiota fermentation (GMF) enhance the antioxidant capacities of blackberry polyphenols. Blackberry supplementation increased glucose consumption and glycogen content in HepG2 cells post-GID and GMF. It also mitigated high-glucose-plus-palmitic-acid-induced ROS overproduction, restored glutathione, and maintained mitochondrial membrane potential. These findings suggest blackberry polyphenols possess potent antioxidant and antidiabetic activities even after digestion.

Evidence strength: Weak to preliminary. Antidiabetic effects are demonstrated in cell and animal models and corroborated by ethnobotanical traditions, but no published human clinical trial has validated antidiabetic outcomes for Rubus supplementation.

5.5 Antimicrobial Activity

A systematic review explored the antioxidant and antimicrobial effects of blackberry leaves. Many in vitro and in vivo studies were assessed, and the review concludes that the free radical scavenging, antimicrobial and anti-inflammatory effects are well demonstrated.

The antimicrobial, antioxidant, and anti-inflammatory characteristics of aqueous raspberry extract have been explored through in vitro assays. An aqueous extract of R. idaeus was examined for its antimicrobial activity against Streptococcus mutans and Candida albicans using the agar-well diffusion method.

The MIC and MFC values (10.0 mg/mL and 30.0 mg/mL, respectively) were the same for lambertianin C, sanguiin H-6, and complex ellagitannin preparations tested against Geotrichum candidum in vitro.

Evidence strength: In vitro only. No clinical trials have evaluated Rubus preparations for antimicrobial endpoints in humans.

5.6 Anticancer and Cytotoxic Activity

Extensive chemical, in vitro and in vivo studies have been performed to validate these benefits and their possible applications as an aid when treating several chronic degenerative diseases. While many diseases could be co-adjuvanted by the intake of phenolic compounds, the research focus is on their effects on cancer.

Research on Rubus coreanus has explored mechanisms related to immune checkpoint pathways: Previous studies showed that the R. coreanus extract (RCE) and its main constituent ellagic acid possess diverse biological activities. The effects of RCE on antitumor immunity and T cell function were investigated, and the present study describes the anti-tumor effect of RCE in humanized PD-1 mice by blocking the PD-1/PD-L1 interaction. These remain preclinical findings.

Evidence strength: Preliminary/preclinical. Cytotoxic and anticancer activities are demonstrated in cell lines and animal models only; no human clinical trials have validated oncological outcomes for Rubus supplementation.

5.7 Endometriosis (Animal Model)

A study assessed the role of Rubus idaeus leaf extract (RiDE) as a potential therapeutic agent in reducing the size of endometriotic lesions and modulating the plasma expression of MMP-2, MMP-9, and TGF-β1. The endometriotic lesions were induced in a rat model by autologous transplant of endometrium. Thirty-six female Wistar rats with induced endometriosis were divided into four groups treated for 28 days. Groups received the vehicle, dienogest (1 mg/kg/day), RiDE (0.25 mL/kg/day), or the combination of both. Rats' weight, endometriotic lesion diameter and grade, and plasma levels of MMP-2, MMP-9, and TGF-β1 were assessed before and after treatment.

Evidence strength: Preclinical only. No human data exist on the use of Rubus for endometriosis.

5.8 Obesity and Lipid Metabolism

After an oral administration for 8 weeks in high-fat-diet-induced obese mice, the butanol fraction of unripe R. coreanus (10 and 50 mg/kg/day) produced a significant decrease in body weight, food efficiency ratio, adipose tissue weight and LDL-cholesterol, serum glucose, TC, and TG levels. It also significantly suppressed elevated mRNA levels of PPARγ in adipose tissue in vivo.

Evidence strength: Animal only. No human clinical trials have confirmed antiobesity outcomes for Rubus extracts.

6. Body Systems and Health Areas of Association

Reproductive / Female Gynecological System: Historically the most prominent area of use. Traditional uterine tonic, dysmenorrhea relief, and parturition support. EMA/HMPC recognizes traditional use for period spasms.
Gastrointestinal System: The HMPC recognizes raspberry leaf for traditional use in the symptomatic relief of diarrhea, as well as mouth and throat inflammation. Tannins provide an astringent mechanism relevant to these indications.
Musculoskeletal System: Supported by the phase II RCT on knee OA pain (see Section 5.2).
Cardiovascular System: Antihypertensive and vasorelaxation activities have been determined for raspberry fruit in preclinical studies.
Metabolic / Endocrine System: Antidiabetic and anti-obesity evidence from cell and animal models (Sections 5.4 and 5.8).
Immune System / Oncology: Cytotoxic and immunomodulatory activity demonstrated in preclinical models (Section 5.6).
Urinary / Renal System: The dried fruits of R. chingii have been widely used in traditional Chinese medicine for the treatment of kidney enuresis and urinary frequency for centuries.
Oral Health: The astringent tannin-rich preparations have a traditional role as a mouthwash and gargle for mouth/throat inflammation, recognized by the EMA/HMPC.

7. Dosage Forms and Reported Dosages

Dosages vary by species, plant part, and preparation. The following are dosages drawn directly from published studies and regulatory assessments:

Raspberry leaf tablet (labor/pregnancy RCT, Simpson et al. 2001): Women treated in the RCT were given 1.2 g of raspberry leaf twice daily (total 2.4 g/day) from 32 weeks of pregnancy to labour.
Dry aqueous extract (dysmenorrhea, EMA-registered products): Active ingredients: dried aqueous extract (4:1), raspberry leaf 113 mg, equivalent to 452 mg of herbal substance per tablet. Indication: traditionally used for the symptomatic relief of painful menstrual cramps. Posology: Adults: 1–2 tablets to be taken after meals whilst discomfort lasts. Not recommended for use in the elderly or in children under 12 years of age.
Capsule (knee OA, Phase II RCT): Participants received one daily capsule during 3 months of either Rubus idaeus leaf extract 400 mg or 200 mg or placebo.
Unripe R. coreanus extract (animal antiobesity study): An oral administration for 8 weeks in high-fat-diet-induced obese mice used doses of 10 and 50 mg/kg/day.

No standardized, universally agreed-upon human dosage for Rubus across indications has been established. The EMA/HMPC monograph-recognized doses above represent the most authoritative guidance for traditional use in Europe.

8. Safety Considerations and Drug Interactions

8.1 General Safety Profile

At the time of the HMPC assessment, no side effects had been reported with raspberry leaf medicines.

A search of the EudraVigilance database detected no new safety issues for Rubus idaeus L. folium.

Raspberry leaf, consumed in tablet form, was found to cause no adverse effects for mother or baby in the randomized controlled trial.

8.2 Use in Pregnancy

This is the most extensively debated safety dimension for Rubus idaeus. Despite widespread traditional use, the regulatory and scientific consensus is guarded:

A review of 12 original publications with focus on safety or efficacy during pregnancy, pharmacology, and in vitro tests found that limited documentation exists and part of it is 50 years old or older. Only the latest animal study indicates an increased risk for the unborn child; however, all the studies are small and cannot rule out negative effects on pregnancy outcome. The efficacy of raspberry leaf is not convincingly documented. The use of raspberry leaf in pregnancy is a traditional herbal therapy recommended by some midwives. Due to the lack of evidence for safety and efficacy, such recommendations are questionable.

Toxicity was demonstrated when high doses were administered intravenously or intraperitoneally in animal studies. These routes of administration are not clinically applicable, but the data indicate that very high doses carry risk.

8.3 CYP Enzyme Inhibition and Drug Interactions

No clinical drug interactions have been reported; however, raspberry leaf extract inhibited CYP1A2, CYP2D6, and CYP3A4 enzymes in vitro, which may be clinically relevant as noted by the EMA. The potential for interaction with other medicines should therefore be considered.

In vitro studies have shown the ability of raspberry leaf preparations to inhibit cytochrome P450 enzymes, which alter the metabolism of drugs. Raspberry leaf tea also exhibits possible mild hypoglycemic effects and may interfere with iron absorption.

8.4 EMA/HMPC Regulatory Status

The EMA/HMPC has classified raspberry leaf (Rubi idaei folium) under the category of traditional herbal medicinal product — meaning its recognized indications rest on traditional use rather than demonstrated clinical efficacy via controlled trials. The HMPC conclusions cover uses for relief of period spasms, mouth or throat inflammation, and diarrhoea, based on traditional use. Although there is insufficient evidence from clinical trials, the effectiveness is considered plausible and there is evidence of safe use for at least 30 years (including at least 15 years within the EU).

References

Health Conditions

Health conditions that Rubus may help support.

No conditions available.

Body Systems

Body systems that Rubus may help support.

No body systems available.