Metabochoice Forskolin These increases seen only in the test groups receiving forskolin treatments were noted in levels of free serum testosterone. [3] Much of the available testosterone in your body is bound to another hormone, referred to as sex hormone binding globulin. ‘Free’ testosterone is measurable by blood sampling, and is relatively quick an effective. This measures the amount of testosterone that you have available for use at any given time, and can be an effective means of diagnosing male infertility, erectile dysfunction, low sex drive, and even some symptoms of fatigue.

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