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Nandrolone Decanoate: A Comprehensive Overview Introduction: Nandrolone, distinguished as 19-nortestosterone, is an anabolic steroid. It might naturally appear in minute quantities in the human body after intense or prolonged physical exertion, and during pregnancy. Its structure deviates from testosterone by lacking a carbon atom in the 19th position, which closely aligns it with progestins. Chemistry and Mechanism of Action: Due to its structural similarity to progestins, nandrolon..