Norandrostenedione, also known as 19-norandrostenedione, is a prohormone primarily used as a dietary supplement in bodybuilding and athletic communities. It is metabolized in the body to nandrolone, an anabolic-androgenic steroid, which promotes muscle growth and enhances physical performance. Athletes and bodybuilders often use it to increase strength, endurance, and recovery after workouts. It is also incorporated into formulations for fat loss while maintaining lean muscle mass. However, its use is highly controversial, banned in competitive sports by organizations like WADA due to performance-enhancing effects, and associated with potential health risks including hormonal imbalances. It has been researched for roles in hormone therapy, but approved medical applications are limited.