Deca Durabolin, which is also known as Deca and Nandrolone decanoate, is a popular anabolic steroid that is commonly recommended to provide dramatic relief to HIV/AIDS patients and use of this steroid is associated with immune system enhancements. Belonging to the category of anabolic-androgenic steroids and classified as a 2.16 anabolic steroid, it has the ability of stimulating endurance and muscle function gains and promoting muscle growth and size to a significant extent.