precisely what is Swiss Chems MK677 Ibutamoren? MK-677, generally known as ibutamoren or ibutamoren mesylate, can be a peptide that belongs to the growth hormone secretagogues team (GHSR). It works by mimicking the action with the hunger hormone ghrelin. It binds to at least one of the growth hormone secretagogue receptors (GHSR) while in the brain