yaetsya simple. Testosterone affects the gonadotrophic hormones, which in turn are responsible for the formation of sperm. Themoretestosterone than the permissible level, themoreit suppresses gonadotropins, the lower the sperm produced. The introduction of 100 mg of testosterone with a small amount of progestin is completely stops the production of sperm.
Scientists are going to use this unique property to create an androgen male contraceptive. They only confuse the fact that high doses of testosterone can cause side effects: weight gain and decrease the level of "good" cholesterol. To avoid this, scientists are looking for the lowest dose of testosterone, with which still would cause the effect of contraception ...
Elena Lebedeva

Source: ROL