MK-677 vs Ipamorelin: Detailed Comparison
MK-677 and Ipamorelin both stimulate growth hormone release through the ghrelin receptor — but one is taken orally and the other by injection. This comparison covers their mechanisms, evidence, side effect profiles, and practical differences for research contexts.
Educational purposes only. The information on this page is for educational and research purposes only. It does not constitute medical advice, diagnosis, or treatment. Research peptides are not FDA-approved for human therapeutic use unless explicitly stated. Always consult a licensed healthcare provider before using any compound.
MK-677
An oral growth hormone secretagogue — one of the few that doesn't require injection
Full profileIpamorelin
A selective growth hormone secretagogue known for its clean, targeted GH release
Full profile| Criteria | MK-677 | Ipamorelin |
|---|---|---|
| Also Known As | Ibutamoren, Nutrobal, L-163,191 | NNC 26-0161 |
| Primary Uses | Muscle Recovery, Longevity, Fat Loss | Muscle Recovery, Fat Loss, Longevity |
| Research Status | Emerging | Emerging |
| FDA Status | Research Only | Research Only |
| Form | Oral | Injectable |
| Human Studies | ~8 | ~2 |
| Animal Studies | ~30 | ~20 |
| Mechanism | Binds to the ghrelin receptor (GHSR) in the pituitary and hypothalamus, stimulating GH release. Its oral bioavailability and long half-life (~24 hours) distinguish it from injectable GH secretagogues. | Mimics ghrelin and binds to the GH secretagogue receptor (GHSR) in the pituitary, triggering GH release. Unlike GHRP-6, it does not significantly elevate cortisol or prolactin. |
| Stacks With | CJC-1295, Ipamorelin | CJC-1295, BPC-157 |
| Legal Status | Research chemical. Not FDA-approved for human use. Often sold as a SARM (mislabeled). Not a SARM — it is a GH secretagogue. | Research use only. Not FDA-approved for human use. |
Benefits & Risks: Head to Head
MK-677
Benefits
Risks
Ipamorelin
Benefits
Risks
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