Sustanon

Sustanon 250 is a trade name for an oil-based injectable blend of four esterized testosterone compounds:
30mg Testosterone Propionate
60mg Testosterone Phenylpropionate
60mg Testosterone Isocaproate
100mg Testosterone Decanoate

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Sustanon 100 is similar, though with three esters. The smaller dose is for paediatric use.
20mg Testosterone Propionate
40mg Testosterone Phenylpropionate
40mg Testosterone Isocaproate

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.

While the intention of the mixed testosterone esters in Sustanon is to provide more stable serum testosterone levels, a single long-ester testosterone, such as testosterone cypionate or testosterone enanthate, may actually provide more stable serum testosterone levels. It is the preferred method of testosterone replacement in the UK as detailed in the British National Formulary.

Sustanon is a fairly popular anabolic steroid product among those that use anabolic steroids for muscle building purposes.

For therapeutic information and other details, refer to the article on Testosterone.