Nandrolone Phenylpropionate is an injectable anabolic preparation. The active substance is nandrolone. The phenylpropionate ester provides a duration of action of approximately one week after injection. Nandrolone is structurally related to the male sex hormone. Compared with testosterone, it exhibits enhanced anabolic activity and reduced androgenic effects, as demonstrated in animal studies and receptor-binding research, and confirmed in clinical use.
In humans, it has a nitrogen-sparing effect that supports protein metabolism. This is useful in conditions associated with protein deficiency such as chronic debilitating diseases, major surgery, and severe trauma. In these situations, it acts as a supportive adjunct to specific therapy and dietary management. In selected cases of disseminated mammary carcinoma in women, it has been reported to produce objective tumour regression lasting for several months. It also helps relieve bone pain in patients with osteoporosis. A related ester, nandrolone decanoate, has been shown to increase bone mineral content in these patients. At recommended doses, androgenic effects such as virilisation are relatively uncommon. It does not contain the C17-alpha alkyl group, which is associated with liver dysfunction and cholestasis.