what exactly is Swiss Chems MK677 Ibutamoren? MK-677, also known as ibutamoren or ibutamoren mesylate, is usually a peptide that belongs to The expansion hormone secretagogues group (GHSR). it really works by mimicking the action in the starvation hormone ghrelin. It binds to at least one of The expansion hormone secretagogue receptors (GHSR) durin