Nandrolone Decanoate 300mg/10ml for intramuscular injection. (Deca) Nandrolone binds to the androgen receptor to a greater degree than testosterone, but has less overall effect on muscle growth. This steroid is unusual in that unlike most anabolic steroids, it is not broken down into the more reactive DHT, but rather into a less effective product. As such, some of the negative effects associated with most such steroids are somewhat mitigated. The positive effects of the drug include muscle growth, appetite stimulation and increased red blood cell production and bone density. Nandrolone is extensively used by bodybuilders and other athletes seeking an edge in professional competition.