The four testosterone esters are as follows;

30 mg testosterone propionate
60 mg testosterone phenylpropionate
60 mg testosterone isocaproate
100 mg testosterone decanoate

Cumulatively, a 1 ml of the oil solution contains exactly 250 mg of above mentioned testosterone esters. This particular numerical value is clearly depicted in the name of the product, Sustanon-250.

They are provided as an oil solution and are administered by intramuscular injection. The different testosterone esters provide for different elimination half-lives in the body. Esterification of testosterone provides for a sustained but non-linear release of testosterone hormone from the injection depot into the circulation. Sustanon 100 is administered once every 2 weeks and Sustanon 250 is administered once every 3 to 4 weeks.