Sustanon contains testosterone esters (testosterone propionate, phenylpropionate, isocatproate, and decanoate). These are derivatives of the naturally occurring male sex hormone testosterone produced by the testicles. Testosterone is the main hormone essential for male sex organs and characteristics
Sustanon 250 injections are prescribed to men with low natural testosterone levels, as a testosterone booster or replacement therapy. It is also prescribed to female to male transsexuals, to assist hormonal transition and allow the development of male sexual characteristics.