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.
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