From Examine.Com
These are supplements that have been shown to increase testosterone levels in the body. Unlike the Testosterone Booster category page, which is more comprehensive, this page excludes supplements that have been shown to be ineffective.
However, we will include supplements that have been shown to increase testosterone in laboratory animals but do not have human trials looking at testosterone. These are uncertain compounds.
Some compounds that have been shown to increase testosterone in rats, but no accurate human dose can be estimated, have been excluded.
Suggested Supplements
Dehydroepiandrosterone
D-Aspartic Acid
Vitamin D
Zinc
Ginger
Fenugreek
Bulbine Natalensis
For more information:
http://examine.com/stacks/increasing-testosterone.html