precisely what is Swiss Chems MK677 Ibutamoren? MK-677, generally known as ibutamoren or ibutamoren mesylate, is usually a peptide that belongs to The expansion hormone secretagogues group (GHSR). It works by mimicking the action on the starvation hormone ghrelin. It binds to one of the growth hormone secretagogue receptors (GHSR) during the brain,