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What is Testosterone propionate Testosterone propionate is a short-acting injectable form of testosterone, supplied in multidose vials containing an oil-based solution. It is a naturally identical androgen molecule modified by the propionate ester, which allows for rapid absorption and predictable clearance from the body. Compared to longer esters such as cypionate or enanthate, the propionate variant provides a faster onset and shorter duration, making it suitable for regimens where precise ..