Raspberry (Black & Red)
Also known as: Black Raspberry, Red Raspberry, Rubus occidentalis, Rubus idaeus, raspberry ketones, raspberry leaf extract
Effective Dosage
No established dose
What the Science Says
Raspberries — both red and black varieties — are fruits packed with polyphenols, anthocyanins, and vitamin C, which are compounds that act as antioxidants in the body. Early laboratory and animal research suggests these compounds may help reduce oxidative stress and inflammation, and some preliminary work points to possible benefits for heart health, blood sugar regulation, and gut health. However, no strong clinical trials from the provided data confirm these effects in humans at specific supplement doses, so most health claims remain speculative.
What It Doesn't Do
Raspberry ketones won't burn fat — that claim is based on isolated lab studies using massive doses, not real-world supplements. Won't replace a healthy diet. No proven cancer-fighting effect in humans. Red raspberry leaf is traditionally used for pregnancy support, but clinical evidence is very limited — don't self-medicate during pregnancy. Eating raspberries is not the same as taking a concentrated extract, and extracts are not proven superior.
Evidence-Based Benefits
Black raspberry (BRB) lozenges significantly reduced benzo[a]pyrene-induced DNA adducts in buccal cells of smokers by up to 36.1% after 8 weeks (PMID: 39367810), and reduced the oxidative stress biomarker 8-oxodG by ~17% in buccal cells and urine (PMID: 38286439), suggesting chemopreventive potential in oral cancer risk. Unripe black raspberry extract (BRE) at 9600 mg/day for 12 weeks significantly improved urinary symptom scores (IPSS and IPSS-QoL) in men with andropause symptoms, though it did not significantly affect aging male symptom scores or sex hormone levels (PMID: 37571251). Raspberry ketone has shown in vitro and in vivo hepatoprotective effects via AMPKα/NRF2 pathway activation in antibiotic-induced toxicity models (PMID: 40958407), though this is preclinical data only.
Weak EvidenceEffective at: No established dose from provided studies for general use; BRB lozenges used at 5g/day (5 x 1g lozenges) in cancer prevention trials; BRE used at 9600 mg/day in male climacteric trial
Source: auto-research
Absorption & Bioavailability
Unknown — anthocyanins from berries are generally considered to have moderate-to-poor bioavailability in humans, and absorption varies significantly by individual gut microbiome composition. Supplement extract bioavailability is not well characterized.
Red Flags to Watch For
- Raspberry ketone supplements are heavily marketed for weight loss but have virtually no credible human clinical evidence supporting this use.
- Red raspberry leaf is sometimes promoted for inducing or easing labor — pregnant women should consult a doctor before use, as safety data is limited.
- Many products combine raspberry extract with stimulants or other unproven ingredients, making it impossible to attribute any effect to raspberry alone.
- Dose standardization is inconsistent across products — labels rarely specify which compounds are standardized or at what concentration.
- Limited published research available — only 2 clinical trials indexed, with no abstracts provided for review.
Research Sources
- General knowledge
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06