biogenic xr largely responsible for our transformation into man. But this impact does not stop at the time of the adolescence, fortunately !! On the contrary, with high levels up to the age of about 30 years, biogenic xr is a major asset for anyone who loves bodybuilding, who wants to develop his body and physique. biogenic xr, Muscle Mass and Strength Gain biogenic xr and muscle mass As we have already pointed out, it is in adolescence that the muscle mass intake starts, directly related to the increase of biogenic xr .