Sustanon 250 is a testosterone hormone. Although synthetic it is a perfect replica of the naturally produced primary male androgen testosterone. By the esters that are attached, this is what defines Sustanon 250 and differentiates it from other testosterone compounds. The compound carries a mixture of small and large esters in a precise dose. It is the precise dose of each of the four testosterone esters that make it. You could take four other testosterones and combine them in the same dosing strength but this would not make it Sustanon 250. This is important because there are underground labs that try to pass off other mixtures as Sustanon 250.
30mg Testosterone Propionate
60mg Testosterone Phenylpropionate
60mg Testosterone Isocaproate
100mg Testosterone Decanoate