Sustanon 250 is an oil-based injectable testosterone blend, developed by Organon. It typically contains four different testosterone esters: Testosterone propionate (30 mg); testosterone phenylpropionate (60 mg); testosterone isocaproate (60mg); and testosterone decanoate (100 mg), although a lower dosed version is also produced. An intelligently “engineered” testosterone, Sustanon is designed to provide a fast yet extended release of testosterone.