Nandrolone decanoate is very similar to testosterone in structure, although it lacks a carbon atom at the 19th position (hence its other name 19-nortestosterone). Nandrolone is a modified 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 decanoate provides a sharp spike in nandrolone release 24-48 hours following deep intramuscular injection, which steadily declines to the near baseline levels approximately two weeks later. The half-life of nandrolone decanoate is 7-12 days.
Like testosterone, nandrolone decanoate 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. Deca is known as a very “fast” builder. The muscle-building effects of this drug is quite noticeable, but not dramatic. In general, one can expect to gain muscleweight at about half the rate of that with an equal amount of testosterone.