what exactly is Swiss Chems MK677 Ibutamoren? MK-677, also known as ibutamoren or ibutamoren mesylate, can be a peptide that belongs to the growth hormone secretagogues group (GHSR). It works by mimicking the motion in the starvation hormone ghrelin. It binds to at least one of the growth hormone secretagogue receptors (GHSR) within the brain, supp