Improves muscle mass Improves muscle endurance and recovery Improves vascularity Fat loss Ostarine attaches to specific proteins in the muscle cells called the Androgen receptors. Once bound to these receptors, it stimulates the muscle cells to increase the rate of protein synthesis, leading to muscle gain and improved recovery after an injury. Ostarine is popular among bodybuilders because it has been shown to add significant muscle mass and reduce body fat. Ostarine can also be used as part of a cutting cycle. The best way to use it towards cutting is to lower the daily dosage to between 15 and 20 mg per day and be sure to reduce your daily caloric intake.