Adaptogen evidence brief
Tongkat ali is an herbal root extract sold for testosterone, libido, stress, and male vitality claims. The practical evidence depends heavily on population and extract quality.
May affect testosterone in some male populations, but broader vitality, strength, or body-composition claims remain under-supported.
Meta-analysis: total testosterone SMD 1.35; effect strongest in hypogonadal men.
Extract standardization and contamination testing are essential; products are not interchangeable.
Testosterone changes are a limited biomarker outcome and should not be treated as proof of visible body-composition or performance change.
Source Drawer
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.
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