What is Swiss Chems MK677 Ibutamoren? MK-677, also called ibutamoren or ibutamoren mesylate, is actually a peptide that belongs to the growth hormone secretagogues team (GHSR). It works by mimicking the motion on the hunger hormone ghrelin. It binds to at least one of The expansion hormone secretagogue receptors (GHSR) within the brain, helping enh