Sustanon 250 is a trade name owned by Organon Pharmaceuticals for an oil-based injectable blend of four esterized testosterone compounds:
30 mg testosterone propionate60 mg testosterone phenylpropionate60 mg testosterone isocaproate100 mg testosterone decanoateSustanon 100 was similar, though with three esters. This smaller dose was usually for pediatric use.
20 mg testosterone propionate40 mg testosterone phenylpropionate40 mg testosterone isocaproateSustanon 100 has not been produced since 2009.
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.
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