[Lotus]

These are some of the points of interest from the guide:




—> Testosterone affects sexual features and development. In men, it is made in large amounts by the testicles. In both men and women, testosterone is made in small amounts by the adrenal glands; and, in women, by the ovaries.

—> The pituitary gland controls the level of testosterone in the body. When the testosterone level is low, the pituitary gland releases a hormone called luteinizing hormone (LH). This hormone tells the testicles to make more testosterone.

—> Exogenous testosterone, or testosterone that does not come from a man's Leydig cells, affects the production of natural testosterone in the testicles. The testicles stop producing their own testosterone by introducing exogenous testosterone to the body via testosterone injections, oral medication, skin patches, creams or gels.

—> The testicles shrink because exogenous testosterone shuts down their normal testosterone production system. Testicular atrophy can cause testis to shrink, other reasons are cold temperature, anabolic steroids and Testosterone replacement therapy.

—> Serum testosterone decreased 19% during a 4-week use of soy protein powder and increased within 2 weeks after we discontinued soy protein powder.