Sustanon 250 Sustanon 250 is a testosterone mix / blend developed with the goal of creating a “long lasting” means of administering hormone replacement therapy. Sustanon consists of 4 different Testosterone esters. 100mg/ml Testosterone Decanoate; 60mg/ml Testosterone Isocaproate; 60mg/ml Testosterone Phenylpropionate and 30mg Testosterone Propionate.