The effects of amino acid supplementation on hormonal responses to resistance training overreaching
Testosterone starts declining 1 - 2 percent per year starting in your thirties, and it leads to decreased confidence; feelings of helplessness; low or no sex drive; loss of muscle mass or less of a
muscle response to resistance training; and loss of pubic hair and clitoral size.
Secondly, if the right training method is chosen, the hypertrophic (growth)
response to resistance training can be even further reduced.