Testosterone is essential for the development and maintenance of reproductive tissue such as testis, prostate, epididymis, seminal vesicles and penis as well as other characteristic male properties such as increased muscle strength, hair growth etc.
Sustanon from Merck (Schering-Plough/Organon) is approved by the authorities for replacement therapy for confirmed testosterone deficiency in males. Your doctor may prescribe Sustanon from Organon for other reasons. The drug was developed as a hormone replacement therapy (HRT) solution, and it was thought at the time that the different esters would be able to provide a constant release of Testosterone over a months time. Sustanon from Organon is a blend of different estered testosterones (4 of them): testosterone propionate - 30 mg, testosterone phenylpropionate - 60 mg, testosterone isocaproate - 60mg, and testosterone decanoate - 100 mg.