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What is Testosterone cypionate (ampoules) Testosterone cypionate in ampoules is an injectable oil-based form of testosterone, designed for slow and steady hormone release into the bloodstream. It represents a long-acting androgenic–anabolic compound, chemically identical to endogenous testosterone, but modified with the cypionate ester to prolong its activity. The ampoule format ensures accurate dosing, sterility, and stable concentration, making it suitable for controlled, long-term administ..