Tongkat ali
Raised testosterone in 5 small trials.
Grade B: Some human proof
Small, early or mixed results in people.
The grade is for the use people talk about, not for every use. Filed under: Testosterone boosters, over the counter.
How it works
A root extract from Southeast Asia.
How it was given in studies
By mouth. In the trials people swallowed it as a capsule, tablet, powder or drink.
This is what the studies did. It is not a how-to.
What studies saw
A review pooling 5 trials in men found higher total testosterone, including in men who started low.
The trade-off
Only 5 small trials, with a wide spread of results. The authors said more research is needed before clinical use.
When it showed up, in studies
Trial lengths varied. No clear timeline.
Sources
Put this grade on your site
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Keep going
We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.