what's Swiss Chems MK677 Ibutamoren? MK-677, often called ibutamoren or ibutamoren mesylate, is usually a peptide that belongs to The expansion hormone secretagogues team (GHSR). It works by mimicking the action from the starvation hormone ghrelin. It binds to at least one of the growth hormone secretagogue receptors (GHSR) inside the Mind, support