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What is nandrolone phenylpropionate Nandrolone phenylpropionate, known as NPP, is the short-ester version of nandrolone. It has a noticeably faster onset of action than nandrolone decanoate, with active levels appearing in the blood within a few days of injection. This makes it a popular choice among athletes who prefer shorter, more flexible cycles or want to avoid long-lasting suppression after discontinuation. The ampoule form provides accurate single doses and high sterility, making it s..