Nandrolone Phenylpropionate (NPP) is a synthetic androgenic anabolic steroid (AAS) that was first created in the early 1960s. It is a derivative of nandrolone, which is a testosterone derivative. NPP is classified as a moderate- to high-potency AAS, meaning that it has a greater than average ability to promote muscle growth. Nandrolone Phenylpropionate (NPP) was…