Nandrolone decanoate is a popular steroid which is structurally similar to testosterone, minus a carbon atom at the 19th position. This creates a steroid that exhibits less androgenic properties compared to that of Testosterone, resulting in the conversion to a weaker metabolite- dihydronandrolone, not DHT. Androgenic related side effects are still possible, but are likely to be of a less occurrence compared to that of the likes of testosterone. The compound is usually referred to as ‘deca’ as deca-durabolin was the brand name by Organon for their nandrolone decanoate.
Nandrolone decanoate has been shown to have a lower tendency to convert to oestrogen. Oestrogen related side effects are possible, but are usually confined to those who use excessive dosages of the steroid, or those who are sensitive to such side effects.