Ipamorelin vs MK-677
Research & educational use only. This content is not medical advice. Consult a qualified healthcare professional before using any peptide compound.
Ipamorelin and MK-677 are both growth hormone peptides that come up together constantly. This is a side-by-side comparison on the data that actually matters — evidence tier, FDA status, human trials, and how to source each safely — not hype. It is for research and educational purposes only.
Ipamorelin vs MK-677: side-by-side
| Ipamorelin | MK-677 | |
|---|---|---|
| Evidence tier | Tier 3 | Tier 2 |
| FDA status | Not FDA Approved | Investigational |
| Human RCTs | 0 | 5 |
| Subjects enrolled | 0 | 600 |
| Animal studies | 20 | 20 |
| Category | growth hormone | growth hormone |
| Half-life | Reported plasma half-life around 2 hours in animal models. | Long half-life supporting once-daily oral dosing. |
| Community logs | 1 | 1 |
Key differences
MK-677 rests on stronger human evidence (Tier 2) than Ipamorelin (Tier 3) — that means more confidence its observed effects are real rather than artefacts of weaker study designs. Neither is FDA approved for human use — both are not fda approved / investigational and treated as research compounds in the US.
Ipamorelin has 0 human trials on record (0 subjects) versus MK-677's 5 (600 subjects). Evidence tiers are a shorthand for how strong that human data is — see our guide to understanding peptide evidence tiers for how to weigh them.
What is Ipamorelin?
Ipamorelin is a synthetic pentapeptide and selective growth hormone secretagogue that mimics ghrelin at the GHS-R1a receptor to stimulate pulsatile growth hormone release. It is not FDA-approved and has not been evaluated in published human efficacy randomized controlled trials; the evidence base is preclinical. It is… Full Ipamorelin breakdown →
What is MK-677?
MK-677 (ibutamoren) is an orally active, non-peptide growth hormone secretagogue that mimics ghrelin at the GHS-R1a receptor to raise growth hormone and IGF-1. Despite extensive clinical investigation it has never received FDA approval, and recognized effects include increased appetite and reduced insulin sensitivity.… Full MK-677 breakdown →
Where to buy Ipamorelin or MK-677 safely
Both are sold by research-chemical suppliers, not pharmacies, so the source matters as much as the compound. Before buying either, vet sellers on third-party lab testing and enforcement history in the ranked directory of trusted peptide sellers — or jump straight to vetted sources for Ipamorelin or MK-677. PeptidesHub does not sell either compound.
Frequently asked questions
Ipamorelin and MK-677 are both growth hormone peptides. MK-677 rests on stronger human evidence (Tier 2) than Ipamorelin (Tier 3) — that means more confidence its observed effects are real rather than artefacts of weaker study designs. Neither is FDA approved for human use — both are not fda approved / investigational and treated as research compounds in the US. See each compound's full evidence breakdown for the underlying studies.