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Research Overview
Oral non-peptide ghrelin mimetic (GHS-R1a agonist); stimulates pulsatile GH release from pituitary somatotrophs and downstream IGF-1 production via the same receptor pathway as endogenous ghrelin, without injection. Appetite stimulation is a direct co-consequence of GHS-R1a activation.
Overview
MK-677 (ibutamoren) is an oral ghrelin mimetic that activates ghrelin receptors (GHS-R1a) to stimulate pulsatile growth hormone release and downstream IGF-1 production. Unlike injectable GHRH analogues and GHRPs, its oral bioavailability and approximately 24-hour half-life enable once-daily dosing, which has made it a subject of research interest for prolonged GH-axis modulation studies.
Research using MK-677 has explored its effects on body composition, sleep architecture, nitrogen balance, and bone mineral density. Clinical studies have generally used doses between 10–25 mg daily, with IGF-1 and GH pulse metrics used as primary pharmacodynamic endpoints.
The compound's appetite-stimulating properties stem from the same ghrelin-receptor pathway that drives GH release — ghrelin is the endogenous 'hunger hormone', so GHS-R1a activation inevitably engages appetite centres alongside somatotroph stimulation. This dual effect is a consistent finding across MK-677 research contexts.
Compliance
Sold strictly as a research chemical for non-human, in-vitro, and laboratory use
FDA approved compound
Listed as prohibited under WADA anti-doping regulations
Prescription availability in Australia and internationally
In Australia, mk-677 (ibutamoren) has no TGA approval for therapeutic use. It is sold by Capital Precision Labs strictly as a research chemical for non-human, in-vitro, and laboratory research use only.
Pharmacology
Oral non-peptide ghrelin mimetic (GHS-R1a agonist); stimulates pulsatile GH release from pituitary somatotrophs and downstream IGF-1 production via the same receptor pathway as endogenous ghrelin, without injection. Appetite stimulation is a direct co-consequence of GHS-R1a activation.
Support
For research use only. Capital Precision Labs products are not approved by the TGA for therapeutic use. By purchasing you confirm you are a licensed research entity or qualified professional.