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Ostarine (MK-2866) is an investigational selective androgen receptor modulator (SARM) that has been widely studied for its potential use in a variety of medical conditions. It has also become popular among bodybuilders and athletes due to its purported ability to increase muscle mass, reduce body fat, and improve overall physical performance.   Ostarine can help you build muscle Ostarine, also known as MK-2866, is an anabolic agent commonly used by bodybuilders and athletes to help them build muscle mass. It works by increasing the amount of nitrogen that your body can absorb and use to produce proteins, which are the building blocks of muscle. It also has the added benefit of helping to retain lean body mass while cutting fat. Studies have found that taking Ostarine can significantly increase the amount of lean muscle mass that you are able to build. One study found that when a group of men took 25mg of Ostarine for 8 weeks, they were able to gain an average of 4.1kg of lean