What MK-677 is
MK-677 is an orally active ghrelin receptor agonist. A non-peptide growth hormone secretagogue active by mouth, studied for sustained elevation of GH and IGF-1 without injection.
Class and mechanism
MK-677 is an orally active ghrelin receptor agonist. A non-peptide growth hormone secretagogue active by mouth, studied for sustained elevation of GH and IGF-1 without injection.
Where it sits
Growth hormone itself and the secretagogues that prompt its release are different things. Somatropin is the hormone. A secretagogue acts on the GHRH or ghrelin receptor to raise the body's own output.
Other names
MK-677 is also written as Ibutamoren and Nutrobal. The same molecule appears under more than one name, which is worth knowing when comparing listings between suppliers.
Others in the growth hormone and secretagogues range
MK-677 sits in the growth hormone and secretagogues group. The compounds below share that grouping, which is the useful starting point when comparing one against another: same group means the comparison is like for like, different group usually means it is not.
| Compound | Class | Listings | From |
|---|---|---|---|
| HGH | Recombinant human growth hormone (191 amino acids) | 6 | £60 |
| Ipamorelin | Growth hormone secretagogue (GHRP) | 3 | £28 |
| CJC-1295 (no DAC) | GHRH analogue | 2 | £33 |
| Tesamorelin | Stabilised GHRH analogue | 2 | £55 |
| HGH Fragment 176-191 | C-terminal fragment of human growth hormone | 1 | £75 |
| GHRP-2 | Growth hormone releasing peptide | 1 | £35 |
Is it held in UK stock?
Stock held in the UK ships domestically, with no customs step. The product page carries live stock rather than a cached figure.
Quanta Pharma MK-677 (Ibutamoren) 12.5mgin stock£36
Availability checked 2026-09-09. The product page carries live stock.