what's Swiss Chems MK677 Ibutamoren? MK-677, often called ibutamoren or ibutamoren mesylate, is a peptide that belongs to The expansion hormone secretagogues team (GHSR). It works by mimicking the action on the hunger hormone ghrelin. It binds to 1 of The expansion hormone secretagogue receptors (GHSR) inside the brain, encouraging maximize expansi