what's Swiss Chems MK677 Ibutamoren? MK-677, often known as ibutamoren or ibutamoren mesylate, is often a peptide that belongs to The expansion hormone secretagogues group (GHSR). It works by mimicking the action from the starvation hormone ghrelin. It binds to 1 of The expansion hormone secretagogue receptors (GHSR) during the brain, serving to ra