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Nandrolone phenylpropionate (NPP) is a short-acting injectable anabolic steroid in the nandrolone family, closely related to nandrolone decanoate (Deca). It is described as highly anabolic with mild androgenic effects.
Because it has a shorter ester, it acts faster in the body. Compared to longer-acting nandrolone forms, it is often associated with different water retention patterns and a shorter duration of effects.