Testosterone acetate injections are one of the most popular forms of treatment for low testosterone levels or hypogonadism in adult males. Injections are also commonly used by bodybuilders to enhance muscle gains. testosterone is responsible for a number of functions in the body. It’s a primary androgenic hormone that is responsible for the development and growth of secondary male or masculine characteristics. It is produced in the Leydig cells of the testicles and regulates gonadotropin secretions, stimulates skeletal muscle, It also has a number of protein anabolic properties mainly noted for its ability to retain calcium, potassium, nitrogen, and phosphorus ll important aspects of muscle mass and bone tissue maintenance in adult males.