Ostarine is primarily used in the field of medicine and fitness due to its selective androgen receptor modulator (SARM) properties. It is researched for its potential to treat muscle wasting diseases, such as cachexia, which often occurs in patients with chronic illnesses like cancer or HIV. By selectively targeting muscle and bone tissues, it helps in increasing muscle mass and strength without the adverse effects typically associated with anabolic steroids.

In the fitness and bodybuilding communities, Ostarine is sometimes used off-label to enhance muscle growth and improve physical performance. It is valued for its ability to promote lean muscle development and aid in recovery after intense workouts. However, its use in these contexts is controversial and not approved by regulatory agencies due to potential health risks and lack of long-term safety data.

Additionally, Ostarine is being studied for its potential benefits in treating osteoporosis by promoting bone density and strength. Its selective action makes it a promising candidate for addressing age-related muscle and bone loss, though further clinical trials are needed to confirm its efficacy and safety for these applications.