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What is Sustanon? Sustanon is an injectable form of testosterone that contains four esters with different release rates: propionate, phenylpropionate, isocaproate, and decanoate. This combination ensures a smooth and long-lasting release of testosterone into the bloodstream — from the first hours after injection up to three weeks. Medically, Sustanon is prescribed for male hypogonadism and age-related testosterone decline, helping to normalize libido, mood, bone density, and body composition...