MK-677, also known as Ibutamoren, is a non-peptide selective agonist of the growth hormone secretagogue receptor. It means that MK-677 can stimulate the release of growth hormones in the body which are essential in muscle growth and repair, body composition, metabolism, and overall health.

Some studies have suggested that MK-677 may be effective at increasing muscle mass and strength, particularly in older adults or individuals with muscle-wasting conditions. Research on MK 677 for women has been shown to increase growth hormone levels in women, which may have a number of potential benefits, such as increasing bone density, improving muscle mass and strength, and reducing body fat.