Methylclostebol is primarily used in the field of medicine, particularly in the treatment of conditions that involve muscle wasting or severe weight loss. It is an anabolic steroid that helps in the enhancement of muscle mass and strength, making it beneficial for patients recovering from chronic illnesses or surgeries. Additionally, it has been utilized in veterinary medicine to promote growth and improve feed efficiency in livestock. However, its use is strictly regulated due to potential side effects and the risk of misuse in sports for performance enhancement.