Nandrolone Decanoate, aka “Deca Durabolin” is the brand name for the Organon produced product, first made available in the early 80’s. “Deca” is therefore just a brand name, although currently, the black market slang is to call any Nandrolone product with the Decanoate ester “Deca.”  It’s a progestin, made by removing the carbon atom at the 19th position of the steran nucleus.  British Dragon Gear produces our brand of Deca Durabolin called Decca 250™.