Raspberry Ketone (Rubus idaeus): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does raspberry leaf work to tone the uterus?

Raspberry leaf contains fragarine, an alkaloid compound believed to tone and strengthen uterine smooth muscle. The herb also contains tannins that provide astringent effects. Evidence level C suggests limited clinical trials, but traditional use indicates it may improve uterine muscle tone and potentially reduce labor complications when taken during the final weeks of pregnancy. The exact mechanism remains under investigation.

Is raspberry leaf safe to take during pregnancy?

Raspberry leaf is contraindicated during the first and second trimesters due to its uterine-stimulating properties. Traditional use supports consumption only in the third trimester (typically after 32 weeks) to prepare the uterus for childbirth. Women with a history of preterm labor, miscarriage, or estrogen-sensitive conditions should avoid it entirely. Always consult a qualified healthcare provider before use during pregnancy.

Does raspberry leaf interact with any medications?

Raspberry leaf may interact with hormone-sensitive medications due to potential estrogenic effects. It could theoretically interfere with hormone replacement therapy, hormonal contraceptives, or medications for estrogen-sensitive conditions. The herb may also affect blood sugar levels, requiring caution with diabetes medications. Limited clinical data exists on specific interactions. Consult a healthcare provider before combining with prescription medications.

What is the recommended dosage for raspberry leaf tea?

The standard adult dosage is 2-4 grams of dried raspberry leaf prepared as an infusion (tea), taken once or twice daily. Alternatively, 3ml of tincture may be used daily. For pregnancy preparation, this dosage is typically initiated after 32 weeks gestation. Do not exceed recommended amounts, as higher doses may cause gastrointestinal upset or laxative effects.

Does raspberry ketone really work for weight loss?

Raspberry ketone supplements are marketed for weight loss, but evidence level C indicates insufficient clinical support in humans. Most research has been conducted in animals or laboratory settings, showing potential effects on fat metabolism and adiponectin levels. No robust human clinical trials confirm significant weight loss effects. Regulatory agencies have challenged some marketing claims. Results should not be expected without comprehensive lifestyle interventions.

What are the side effects of raspberry leaf?

Common side effects include mild gastrointestinal upset, nausea, and loose stools, particularly when consumed in excess due to the tannin content. The herb's uterine-stimulating properties may cause premature contractions if taken in early pregnancy. Individuals with estrogen-sensitive conditions may experience adverse hormonal effects. Allergic reactions are rare but possible. Discontinue use if adverse symptoms develop and seek medical advice.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 29 PubMed articles · model: gemma4:31b

Summary

Raspberry ketone (RK) is an aromatic phenolic compound found in red raspberries (Rubus idaeus) and other fruits, investigated for potential metabolic and protective biological activities [PMID:34209554, PMID:34913499].

Background

Raspberry ketone (4-(4-hydroxyphenyl) butan-2-one) is a major aromatic compound of the red raspberry (Rubus idaeus) [PMID:15862604]. It is also naturally occurring in apples, peaches, and kiwifruit [PMID:34209554].

Traditional uses

Rubus idaeus has been used in China to arrest polyuria, nourish the liver, reinforce the kidney, and improve vision [PMID:36341819]. In Lithuanian folk medicine, the leaves and stems are utilized [PMID:35807315]. The leaf is also a purported galactogogue [PMID:30000844].

Active compounds

The red raspberry contains raspberry ketone, polyphenols (including anthocyanins and ellagitannins), and seed oil rich in fatty acids, tocopherols, tocotrienols, carotenoids, flavonoids, and phytosterols [PMID:34065144, PMID:29344587, PMID:34941428].

Mechanism of action

Raspberry ketone-mediated activation of peroxisome proliferator-activated receptor-α (PPAR-α) is identified as one of its main modes of action [PMID:34209554]. In radiation-induced lung injury models, it is reported to act through the STAT2-P2X7r/NLRP3 signaling pathway [PMID:40544736].

Clinical evidence

Evidence DObesity/Weight Loss

In rodent models, RK prevented high-fat-diet-induced elevations in body weight and visceral adipose tissues; however, its effect on human weight loss remains controversial [PMID:15862604, PMID:34913499]

Evidence CHyperglycemia and Dyslipidemia

Bioactive compounds from raspberry, including ketones, have been studied for their ability to reduce blood glucose levels and stabilize blood lipid profiles by inhibiting enzymes such as α-glucosidase and dipeptidyl peptidase-4 (DPP-4) [PMID:34941428]

Evidence DRadiation-Induced Lung Injury (RILI)

In C57BL/6 mice, oral administration of RK alleviated RILI symptoms [PMID:40544736]

Evidence BSkin Aging

A topical serum containing raspberry leaf cell culture extract, vitamin C, and vitamin E was evaluated for anti-aging and brightening effects in female volunteers [PMID:31975502]

Safety & adverse effects

Raspberry leaf used as a tea is generally without side effects, though data on safety in nursing mothers or infants is unavailable [PMID:30000844].

Pregnancy & lactation

Raspberry leaf use is widespread during pregnancy; however, evidence for safety and efficacy is not convincingly documented, and one animal study indicated an increased risk for the unborn child [PMID:19880082, PMID:38649906].

Evidence summary

The evidence for raspberry ketone is primarily based on in vitro and rodent studies (Level D) and reviews (Level C), with very limited human clinical data (Level B) specifically for topical application. Most metabolic claims lack reliable human research.

PubMed sources

1.PMID: 30000844 (2006) — Rational multienzyme architecture design with iMARS. · Cell
2.PMID: 31975502 (2020) — Anti-aging and brightening effects of a topical treatment containing vitamin C, vitamin E, and raspberry leaf cell culture extract: A split-face, randomized controlled trial. · Journal of cosmetic dermatology
3.PMID: 34065144 (2021) — Red Raspberry (Rubus idaeus L.) Seed Oil: A Review. · Plants (Basel, Switzerland)
4.PMID: 34913499 (2022) — Potential metabolic activities of raspberry ketone. · Journal of food biochemistry
5.PMID: 40484583 (2025) — Pectin-type polysaccharides from raspberry (Rubus idaeus L.): structure characterization and activity against DSS-induced colitis. · Carbohydrate polymers

Raspberry Ketone

Sources & Citations

Calculate a safe dose of Raspberry Ketone

Desert Lime

Pine Needle

Wood Sorrel

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Pregnancy & lactation

Evidence summary

PubMed sources

Government sources

Raspberry Ketone

Sources & Citations

Calculate a safe dose of Raspberry Ketone

Related Herbs

Desert Lime

Pine Needle

Wood Sorrel

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Pregnancy & lactation

Evidence summary

PubMed sources

Government sources