What is Swiss Chems MK677 Ibutamoren? MK-677, also called ibutamoren or ibutamoren mesylate, is usually a peptide that belongs to the growth hormone secretagogues group (GHSR). It works by mimicking the action with the hunger hormone ghrelin. It binds to at least one of The expansion hormone secretagogue receptors (GHSR) during the Mind, aiding rai