PHARMA NAN D 300 (Nandrolone Decanoate) is considered a quintessential drug for massive bulk muscle gains and is famously nicknamed "Deca." Due to the significant retention of water in muscles during a "Deca" cycle, overall bulk mass increases occur remarkably fast. Nandrolone decanoate combines well with long esters of testosterone. Nandrolone has become one of the most famous performance-enhancing drugs in sports and bodybuilding thanks to the quantity and quality of body mass gains it has the ability to promote. It has a lower associated risk of androgenic and virilizing effects given its relatively mild nature (37% androgenic activity index compared to testosterone). Nandrolone is known for its ability to reduce joint pain; therefore, if there is discomfort in these areas, nandrolone is an excellent compound to provide some relief and aid in recovery while also strengthening the tissue.

With a half-life of around 6–12 days, nandrolone decanoate ("Deca") has a slow release intended for long cycles.