what's Swiss Chems MK677 Ibutamoren? MK-677, generally known as ibutamoren or ibutamoren mesylate, is actually a peptide that belongs to the growth hormone secretagogues team (GHSR). It works by mimicking the action of your starvation hormone ghrelin. It binds to 1 of the growth hormone secretagogue receptors (GHSR) while in the brain, serving to r