what exactly is Swiss Chems MK677 Ibutamoren? MK-677, also referred to as ibutamoren or ibutamoren mesylate, is really a peptide that belongs to The expansion hormone secretagogues team (GHSR). It works by mimicking the action from the hunger hormone ghrelin. It binds to at least one of the growth hormone secretagogue receptors (GHSR) during the br