Ostarine (MK-2866)

Ostarine (MK-2866), also known as Enobosarm, is a selective androgen receptor modulator (SARM) associated with lean muscle development, muscle preservation and improved body composition. In bodybuilding, Ostarine is primarily discussed in connection with cutting phases, maintaining muscle mass during calorie restriction and supporting strength and recovery.

Ostarine binds selectively to androgen receptors in muscle and bone tissue, activating anabolic signalling involved in muscle protein synthesis and tissue maintenance. Its intended effects include increased lean muscle mass, reduced muscle loss and potential improvements in physical performance and bone strength. Unlike traditional anabolic steroids, Ostarine was developed to provide more selective androgen receptor activity, particularly in muscle and bone. MK-2866 y Enobosarm are alternative names for the same active compound, not separate formulations or esters.