Supra-Testosterone is a proprietary blend of testosterone esters, including Testosterone Propionate, Testosterone Phenylpropionate, Testosterone Isocaproate, and Testosterone Decanoate. This popular blend among bodybuilders is also known by the brand name Sustanon 400. There is no difference between Supra-Testosterone and Sustanon 400 aside from their branding, manufacturer, and price.

This injectable compound consists of four different testosterone esters, each classified as an androgenic anabolic steroid (AAS). The formulation includes 60 mg of Testosterone Propionate, 120 mg of Testosterone Phenylpropionate, 120 mg of Testosterone Isocaproate, and 100 mg of Testosterone Decanoate, totaling 400 mg of testosterone. The purpose of using a blend of these esters is to achieve varying release times of testosterone in the body.

The combination of short-acting and long-acting esters allows for an initial quick release of testosterone, while also providing a sustained release over time due to the long-acting esters.