what's Swiss Chems MK677 Ibutamoren? MK-677, often known as ibutamoren or ibutamoren mesylate, is actually a peptide that belongs to The expansion hormone secretagogues group (GHSR). It works by mimicking the action in the hunger hormone ghrelin. It binds to 1 of the growth hormone secretagogue receptors (GHSR) while in the Mind, helping raise expa