Popularity of Deca Durabolin. The unusual properties of Deca Durabolin are due to its parent steroid, nandrolone, also known as 19-nortestosterone. One of the principal positive qualities of nandrolone is that it has relatively low conversion to estrogen compared to testosterone.eca Durabolin Effects on Hair and Skin. An additional advantage of Deca Durabolin (nandrolone) is that this compound is relatively mild in terms of adverse side effects on the scalp and skin.