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What is sustanon Sustanon is an injectable anabolic-androgenic steroid that contains a blend of four testosterone esters — testosterone propionate, phenylpropionate, isocaproate, and decanoate. Each ester has a different absorption rate, providing a stable and sustained release of testosterone into the bloodstream. Originally developed for hormone replacement therapy (HRT), Sustanon became widely used in sports for its ability to maintain high testosterone levels, support muscle growth, and im..