NANDROLONE PHENYLPROPIONATE are injectable anabolic preparations containing the short-acting nandrolone phenylpropionate ester. Serum nandrolone levels rapidly increase after IM administration with peak serum levels being reached within 24 to 36 hours. NPP clears rapidly avoiding the retention issues associated with the traditional nandrolone decanoate. Nandrolone phenylpropionate accelerates muscle growth, stimulates appetite, increases red blood cell production, and improves bone density.