Nandrolone decanoate is an injectable anabolic steroid whose structure is a modified form of the naturally occurring hormone testosterone. Chemically, it is classified as a 19-nortestosterone derivative, meaning it lacks the methyl group at the 19th position that is found in a testosterone molecule. This structural difference gives nandrolone a higher anabolic-to-androgenic ratio as compared to testosterone. Thus, nandrolone has greater anabolic effects (muscle and bone growth) while producing less androgenic effects (male secondary sex characteristics) than testosterone.
In fact, nandrolone esters (like decanoate) have one of the highest anabolic ratios of any AAS. In androgen-sensitive tissues (such as the prostate and skin), nandrolone is metabolized into a metabolite that has less androgenic effects. Physically, nandrolone causes less hair loss, acne, and prostate enlargement, as compared to testosterone, at equivalent muscle-building doses.
Furthermore, the decanoate ester attached to nandrolone extends its half-life, meaning Deca-Durabolin remains active in the body for a longer period of time.
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