Tongkat Ali has been shown to increase testosterone in healthy young men, with already high testosterone.
According to this study, 600mg of Tongkat Ali (1.45% eurycomanone; 8.5mg total) increased young (average age 24 years) males’ testosterone from 802 to 924ng/dl in just 14 days.
Make sure you get a product specifying eurycomamone content, which seems to be the main ingredient for increasing testosterone.
In summary, use at least 8mg+ eurycomamone per day for a good increase in testosterone.
The LJ100 extract also has evidence behind it showing that it can increase testosterone and inhibit the aromatase.
Products:

>1000ng/dl Testosterone: My Step-by-Step Guide on How I Do It Naturally!
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