Deca Durabolin 100mg Injection by Organon is an injectable steroid. This steroid consists of 100mg per ML of the hormone nandrolone deconoate. Ester present in these steroids makes the hormone release from injection quite slow. Body builders often find that an injection twice per week is more than enough for maintaining the steady blood levels. Since this steroid stays for a long time in the system it is a bad choice for the tested athletes. Those seeking to use the Deca Durabolin 100mg Injection and wanting to have it out of the system quicker, generally opt for a product like NPP (Durabolin). Deca is one of the most popular steroids among body builders today as it is a low androgenic steroid that also has a high anabolic effect. It also aromatizes in high dosages, but not at the rate of testosterone. One side effect that some might experience with this steroid is progesterone build up in the body.