Nandrolone is an anabolic steroid that doctors sometimes prescribe to treat certain illnesses and injuries. However, overuse or misuse of nandrolone can be harmful to your health. Some athletes misuse it to build muscle and improve performance, but this is not approved by the FDA and is banned by most sports organizations. Misuse of nandrolone can lead to serious health issues, including liver tumors, hormonal imbalances, high blood pressure, and increased risk of infections. Always use nandrolone only under a doctor's supervision to avoid these risks.