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Free Testosterone

 
When testosterone is released into the bloodstream, it is mostly bound to a special carrier compound called sex hormone binding globulin or SHBG. SHBG, which is produced by the liver, plays an important role in regulating the amount of free testosterone circulating in the body. In order for testosterone to be biologically available for the body’s use, it must be “unbound” or “free.”

Best Source of Natural Testosterone