what's Swiss Chems MK677 Ibutamoren? MK-677, often known as ibutamoren or ibutamoren mesylate, can be 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) in the Mind, supporting maximize growth