Last verified: today
Kola Extract
Also known as: Garcinia kola, bitter kola, kolaviron, G. kola seed extract, Cola nitida, kola nut extract
Evidence under review. — Not yet rated
Traditional West African seed extract with antioxidant and aphrodisiac effects studied only in animals.
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What it does
Kola extract comes from the seeds of Garcinia kola, a tree native to West Africa used in traditional medicine. Animal studies suggest it has antioxidant properties that may protect brain tissue...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose (insufficient research data)
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Found in
What the Science Says
Kola extract comes from the seeds of Garcinia kola, a tree native to West Africa used in traditional medicine. Animal studies suggest it has antioxidant properties that may protect brain tissue from oxidative damage, and it may support male reproductive function including testosterone levels and sperm count. It has also shown smooth muscle relaxant effects in isolated gut tissue in lab settings. All available evidence comes from animal or cell studies — no human clinical trials have been conducted.
What It Doesn't Do
No proven benefits in humans. Don't expect it to boost testosterone or sexual performance based on current evidence — those studies were done in rats. Not proven to protect your brain or reduce inflammation in people. No weight loss evidence. No cognitive enhancement data.
Evidence-Based Benefits
Reduces oxidative stress markers in rat brain tissue exposed to toxic vanadium.
Weak EvidenceEffective at: No established human dose
Increases testosterone levels and sperm count in male rats at lower doses.
Weak EvidenceEffective at: 100–200 mg/kg in rats; no human equivalent established
Relaxes intestinal smooth muscle contractions in isolated rat gut tissue.
Weak EvidenceEffective at: No established human dose
Absorption & Bioavailability
Unknown — no human pharmacokinetic data available from the provided studies
Red Flags to Watch For
- All supporting research is in animals or isolated cells — zero human clinical trials in the provided evidence
- Kola nut naturally contains caffeine; products may not disclose stimulant content clearly
- High doses in animal studies showed reduced sexual behaviour effects, suggesting a dose-response risk
- Over 1,000 supplement products on the market despite near-total absence of human safety or efficacy data
- Often confused with Cola nitida (caffeine-containing kola nut) and Garcinia kola — these are different plants with different compounds
Products Containing Kola Extract
See how Kola Extract is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25