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Nandrolone phenylpropionate ( NPP ), or nandrolone phenpropionate , sold under the brand name Durabolin amomg others, is a synthetic androgen and anabolic steroid and a nandrolone ester .     It is marketed in many countries throughout the world, including in the United Kingdom and Canada , and along with nandrolone decanoate (Deca-Durabolin), is one of the most widely used esters of nandrolone .   Nandrolone esters like NPP and nandrolone decanoate are prodrugs of nandrolone.