MK677 is a growth hormone secretagogue.
MK-2866 (Ostarine) is a SARM (selective androgen receptor modulator) initially developed for the prevention and treatment of muscle wasting. Future plans indicate that it will eventually be prescribed for the prevention of cachexia, atrophy and sarcopenia as well as for Hormone or Testosterone Replacement Therapy.
MK-2866 works by binding to the androgen receptor demonstrating bone and muscular anabolic activity. Ostarine causes muscle growth by binding and activating the androgen receptor, which alters the expression of genes and increases protein synthesis. Ostarine nearly exclusively exerts its anabolic effects on muscle tissue. It also minimizes atrophy during recover periods from surgeries and injuries making it desirable for so many different types of users and situations. Ostarine is extremely effective in maintaining and gaining lean body mass.