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What is nandrolone phenylpropionate Nandrolone phenylpropionate, often called NPP, is a short-acting form of nandrolone. It was one of the first nandrolone esters developed and remains popular for its fast onset and clean anabolic profile. Compared with nandrolone decanoate, NPP starts working faster and leaves the system sooner, which allows more precise control over results and side effects. Athletes choose NPP for improved recovery, joint comfort, and steady lean muscle gain without the w..