GHK-Cu vs Melanotan II
Research & educational use only. This content is not medical advice. Consult a qualified healthcare professional before using any peptide compound.
GHK-Cu and Melanotan II are both aesthetic 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.
GHK-Cu vs Melanotan II: side-by-side
| GHK-Cu | Melanotan II | |
|---|---|---|
| Evidence tier | Tier 2 | Tier 4 |
| FDA status | Not FDA Approved | Not FDA Approved |
| Human RCTs | 3 | 0 |
| Subjects enrolled | 120 | 0 |
| Animal studies | 50 | 15 |
| Category | aesthetic | aesthetic |
| Half-life | Short systemic half-life; topical effects are formulation-dependent. | Short plasma half-life. |
| Community logs | 0 | 0 |
Key differences
GHK-Cu rests on stronger human evidence (Tier 2) than Melanotan II (Tier 4) — 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 / not fda approved and treated as research compounds in the US.
GHK-Cu has 3 human trials on record (120 subjects) versus Melanotan II's 0 (0 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 GHK-Cu?
GHK-Cu is a copper-binding tripeptide (glycyl-L-histidyl-L-lysine) found naturally in human plasma, with levels declining with age. It is well studied in topical cosmetic formulations for skin appearance, where human data exist; injectable systemic use is not FDA-approved and is largely preclinical. It is used in… Full GHK-Cu breakdown →
What is Melanotan II?
Melanotan II is a synthetic cyclic analog of alpha-melanocyte-stimulating hormone (alpha-MSH) that non-selectively activates melanocortin receptors, producing skin pigmentation and other effects. It is not approved by the FDA for any use, and regulators have warned about unregulated products sold for tanning. Reported… Full Melanotan II breakdown →
Where to buy GHK-Cu or Melanotan II 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 GHK-Cu or Melanotan II. PeptidesHub does not sell either compound.
Frequently asked questions
GHK-Cu and Melanotan II are both aesthetic peptides. GHK-Cu rests on stronger human evidence (Tier 2) than Melanotan II (Tier 4) — 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 / not fda approved and treated as research compounds in the US. See each compound's full evidence breakdown for the underlying studies.