MK-677 SARMS (Ibutamoren, MK-0677, L-163. 191) is an orally administered growth hormone secretagogue. A secretagogue is a substance that promotes secretion. By this standard, MK-677 can be compared to peptides such as GHRP-6 or Ipamorelin. The main advantage is that it can be administered orally and does not require injections nor does it have the side effects that GHRP-6 does. MK-677 was developed with the intention of combating conditions such as muscle atrophy, osteoporosis, and obesity.