Nandrolone phenylpropionate, commonly called NPP, is a shorter-ester form of nandrolone. Its phenylpropionate ester produces a different release profile from the longer decanoate ester used in traditional nandrolone decanoate preparations.

The product designation identifies 150. Exposure to nandrolone can suppress endogenous hormone production and sperm formation and may affect cholesterol, cardiovascular health, fertility, and reproductive function.