what's Swiss Chems MK677 Ibutamoren? MK-677, generally known as ibutamoren or ibutamoren mesylate, is a peptide that belongs to the growth hormone secretagogues team (GHSR). it really works by mimicking the motion in the hunger hormone ghrelin. It binds to at least one of the growth hormone secretagogue receptors (GHSR) from the brain, encouraging