Nandrolone phenylpropionate is virtually interchangeable with nadrolone decanoate. The main difference being the speed at which the nandrolone iis released. NPP is amodified form of nandrolone, where a carboxylic acid ester (decanoic acid) has been attached to the 17-beta hydroxyl group. Esterified steroids are less polar than free steroids, and are absorbed more slowly from the area of injection. Once in the bloodstream, the ester is removed to yield free (active) nadrolone. Nadrolone phenylpropionate provides a sharp spike in nandrolone release 24-48 hours following deep intramuscular injection, which steadily declines to the near baseline levels within a week.
Like testosterone, nandrolone phenylpropionate exhibits relatively strong anabolic properties. Unlike testosterone, however, its tissue-building activity is accompanied by weak androgenic properties. A usual dosage for physique or performance enhancing purposes is 400-800mg per week. It is often stated that nandrolone will exhibit its best gain/side effect ratio at 2mg per pound of bodyweight/weekly. Due to the fast-acting nature of the phenylpropionate ester, the weekly dosage is usually subdivided into 2 separate applications spaced evenly apart.