Nandrolone Decanoate (Deca) is a very anabolic, moderate androgenic form of nortestosterone that was the most commonly used drug to create a rapid build-up of lean muscle mass or as a diet “protein-sparing” drug by athletes of all kinds. This is a longer lasting nandrolone than Durabolin so some water retention resulted with long-term administration (especially in higher dosages). A prominent positive nitrogen balance occurs with the use of nandrolones and therefore a high protein intake was a must for all reported users. If you read the section on protein, you know that nitrogen in its bonded form is a part of protein/amino acids. Since nandrolone promotes nitrogen storage in muscle cells (a positive nitrogen balance) then the cell contains more protein for growth and repair than normal. Remember: This could only happen if above normal calories (with a focus on protein) were ingested. Since nandrolone is moderately androgenic, good strength gains also resulted. Another plus for nandrolone was that most users experienced a joint healing effect during cycles and a suppressed cortisol/cortisone activity due to nandrolones ability to long-term block cortisol receptors.