The claimEvidence B · meta-analysis
Ashwagandha is a testosterone booster
The evidence
Pooled randomized trials show testosterone rises only about 14-15% — still within the body's normal range of variation.
Why the claim spreads
Rides the 'natural testosterone' / biohacking wave; a handful of small studies get amplified by supplement marketing into one sweeping claim.
The mechanism, in brief
Ashwagandha is the root of a plant that Indian traditional medicine has used for about three thousand years; on today's shelves it is sold for stress and sleep. In stressed adults, a few small randomized controlled trials (RCTs, where people are assigned by chance to the herb or to a placebo) found that after about…
Sources (1)
- Chandrasekhar, K., Kapoor, J., & Anishetty, S. (2012). A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of Ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine, 34(3), 255–262. 64 adults with chronic stress, single-centre, randomized double-blind: 300 mg high-concentration full-spectrum root extract twice daily or placebo for 60 days. Scores on all stress scales fell significantly more than on placebo (P < 0.0001); serum cortisol fell 27.9% from baseline vs 7.9% on placebo, a significant difference; adverse effects were mild and comparable in both groups (abstract, PMID 23439798; full text, PMC3573577).