Testosterone is the primary androgenic hormone, promoting functions like libido, muscular development and strength, energy levels, fat loss, cognitive and digestive function. Testosterone also lowers the stress systems. Testosterone production is positively influenced by sufficient calorie intake, dietary carbohydrate (due to insulin), vitamin D, zinc, vitamin A, resistance training and proper sleep, and can be impaired due to oxidative stress, hypothyroidism and inflammation.
Free testosterone is the amount of testosterone that is not protein bound, biologically available to tissues to exert its effects.
This test measures both. Total testosterone is measured through MS and free testosterone is measured through dialysis.
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