Nandrolone Decanoate is an injectable anabolic preparation. The decanoate ester gives the preparation duration of action of about three weeks after injection. Nandrolone Decanoate is chemically related to the male hormone. Compared to testosterone, it has an enhanced anabolic and a reduced androgenic activity. In the human, Nandrolone has been shown to positively influence calcium metabolism and to increase bone mass in osteoporosis. In women with disseminated mammary carcinoma, Nandrolone Decanoate has been reported to produce objective regressions for many months. Furthermore, Nandrolone Decanoate has a nitrogen-saving action. This effect on protein metabolism has been established by metabolic studies and is utilized therapeutically in conditions where a protein deficiency exists.