Zinc
Fixes a shortfall. Did not raise testosterone in well-fed men.
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
An essential mineral the body needs to make testosterone.
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
In 14 healthy active men who already got enough zinc, a supplement raised zinc levels but not testosterone. A review of 38 papers concluded zinc helps when levels are low.
The trade-off
The positive human trials are small and in specific groups.
When it showed up, in studies
No rise in testosterone in men who already get enough.
Sources
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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.