Durobolic nandrolone phenylpropionate by Asia Pharma is a fast-acting form of nandrolone phenylpropionate. Durobolic nandrolone phenylpropionateis chemically related to the male hormone testosterone. Compared to testosterone, it has an enhanced anabolic and a reduced androgenic activity. This has been demonstrated in animal bioassays and explained by receptor binding studies.

The low androgenicity of Durobolic is confirmed in clinical use. 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, Durobolic has been reported to produce objective regressions for many months. Furthermore, Durobolic has a nitrogen-saving action. This effect on protein metabolism has been established by metabolic studies and is utilised therapeutically in conditions where a protein deficiency exists such as during chronic debilitating diseases and after major surgery and severe trauma. In these conditions, nandrolone phenylpropionate serves as a supportive adjunct to specific therapies and dietary measures as well as parenteral nutrition, due to it's faster acting nature nandrolone phenylpropionate is preffered in situations where a faster clinical response is required over it's chemical variant nandrolone decaonate.

Durobolic is one of the few steroids which has been used successfully in AIDS patients to stimulate weight gain, and although athletes using NPP in lieu of Durobolic find it to produce slightly less weight gain, this is probably a result of gaining less water weight. Nandrolone Phenylpropionate, is a more popular drug than Durobolic for use in cutting cycles recently, due to this fact.

This brings up the fact that although Durobolic has a very long active life, NPP has a much shorter one, and this means that people are forced to inject at least two times per week, with the more common protocol being every third day. Results are seen much more quickly with NPP as compared with Durobolic, and it is quickly becoming a much more popular alternative.