Sustanon  is a fairly popular Testosterone preparation that has been available for a very long time and continues to be utilized significantly among bodybuilders and athletes, as well as throughout the medical practice. Sustanon is the brand and trade name for what is essentially a precise blend or mixture of 4 different esterified variants of Testosterone in a specific ratio. The precise ratio of Testosterone variants in the blend are:

30mg of Testosterone Propionate

60mg of Testosterone Phenylpropionate

60mg of Testosterone Isocaproate

100mg of Testosterone Decanoate

Total mg of Testosterone: 250mg per ml.

The cumulative total mg of Testosteorne, as mentioned above, is 250mg combined of these esters. This is also why the 250 is a part of the Sustanon trade name. The original purpose of blending these esters to create a formulation like this is first and foremost for medical purposes, specifically for the treatment of hypogonadism and/or andropause, and it is used as a Testosterone replacement therapy (TRT). More specifically, the ester ratios are designed to provide a combination of rapid release of Testosterone initially into the bloodstream, followed by a slow and more steady release with the intention of providing more stable blood plasma levels and keeping them consistently leveled[1]. By comparison, one could utilized a solitary Testosterone ester, Testosterone Enanthate for example, which is strictly as its name implies: Testosterone Enanthate.