Sustanon 250 is a popular testosterone blend (mixture) and is without question the most popular and well known blend ever made. Manufactured by Organon, the idea behind Sustanon 250 was to provide the best of small (short) and large (long) ester testosterones in a single compound. This would allow the individual to maintain stable blood levels of the testosterone hormone with an infrequent injection schedule while simultaneously receiving fast acting benefits.
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.
This product has the effect of heavy aromatizing therefore the main side effect will be that testosterone will be converted into estrogen. This increase in the levels of estrogen will lead to problems like the development of breast among males and extensive water retention. This might result in high blood pressure.