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By Serge Kreutz (2010)
The following are lab results for free testosterone before and after the usage of 1:200 tongkat ali extract.
Before tongkat ali usage, the trial participant's levels of free testosterone have been determined by the university hospital at Koeln, Germany, to be 15.4 pg/ml. After 4 month of usage of tongkat ali extract, the plasma level of free testosterone was measured as 49.20 pg/ml.
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Copyright Serge Kreutz