Sustanon injections contain testosterone esters (testosterone propionate, phenylpropionate, isocaproate and decanoate). These are derivatives of the naturally occurring male sex hormone testosterone, which is produced by the testicles. Testosterone is the main hormone essential for normal growth, development and function of the male sex organs and male sexual characteristics.
Sustanon injections help to increase testosterone levels. Testosterone is essential for sperm production, sex drive, getting an erection, and the functioning of the prostate gland and other reproductive structures. It also has functions in the skin, muscles, skeleton, kidney, liver, bone marrow and central nervous system.