What is sostenon?

is an injectable blend of four testosterones grouped together in order for best results.

Addition of ecu19:

I believe you mean sustanon 250, which is a, oil based injectable steroid, which is a combination of four different test compounds (from greatest to least):

* Testosterone Decanoate 100mg * Testosterone Phenylpropionate 60mg * Testosterone Isocaproate 60mg * Testosterone Propionate 30mg