exactly what is Swiss Chems MK677 Ibutamoren? MK-677, often known as ibutamoren or ibutamoren mesylate, is really a peptide that belongs to the growth hormone secretagogues group (GHSR). It works by mimicking the action in the hunger hormone ghrelin. It binds to one of The expansion hormone secretagogue receptors (GHSR) while in the brain, helping