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Nandrolone decanoate is an injectable form of the anabolic steroid nandrolone. The decanoate ester provides a slow release of nandrolone from the injection site, lasting up to three weeks. Nandrolone is very similar to testosterone in structure, although it lacks a carbon atom at the 19th position (hence its other name, 19-nortestosterone). Like testosterone, nandrolone exhibits relatively strong anabolic properties.

Unlike testosterone, however, its tissue-building activity is accompanied by androgenic properties. Much of this has to do with the reduction of nandrolone to a weaker steroid, dihydro nandrolone, in the same response target tissues that potentate the action of testosterone (by converting it to DHT). The mild properties of nandrolone decanoate have made it one of the most popular injectable steroids worldwide, highly favored by athletes for its ability to promote strength and lean muscle mass gains without strong estrogenic or androgenic side effects.