Sustanon 250 is a trade name for an oil-based injectable blend of four esterized testosterone compounds. Sustanon 250 is the best-known form of injectable testosterone. It has become so popular for anabolic steroid cycles that the name now extends past the Schering brand and is often given to any steroid preparation made to the same formulation.
Sustanon 250 Contains Four Different Testosterone Esters
30 mg testosterone propionate
60 mg testosterone phenylpropionate
60 mg testosterone isocaproate
100 mg testosterone decanoate
Sustanon 250 contains, per mL, short-acting testosterone propionate, 60 mg of testosterone phenylpropionate, 60 mg of testosterone isocaproate, and 100 mg of testosterone decanoate. The first, testosterone propionate, is short-acting and gives Sustanon a quick onset of action in a steroid cycle. The other esters are medium to long-acting.
The different testosterone esters provide for different half lives. Esterization of the testosterone molecules provides for a sustained (but non-linear) release of testosterone from the injection depot into the blood plasma.
Sustanon is the preferred method of testosterone replacement in the UK and is one of the most popular choice of anabolic steroid among bodybuilders and athletes.