2.5/5
Weak
evidence
Adaptogen evidence brief
Tongkat ali
May affect testosterone in some male populations, but gym-performance, hypertrophy, and strength claims remain under-supported.
Headline Finding
Meta-analysis: total testosterone SMD 1.35; effect strongest in hypogonadal men.
Dose Context
Extract standardization and contamination testing are essential; products are not interchangeable.
Important Caveat
Testosterone changes are a limited biomarker outcome, not proof of muscle gain without training trials.
Source Drawer
Linked Research
- Meta-analysis Testosterone meta-analysis
- Meta-analysis Meta-analysis PDF
- Systematic review Male sexual health systematic review
- Review Evidence-based review
- Review Testosterone boosters review
How To Read This Rating
The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.
Spot An Evidence Issue?
Send the disputed claim, source link, and why it changes the practical verdict. Corrections that materially affect the claim, dose, caveat, or rating are prioritized.
Report a source or rating issue