GHK-Cu
A naturally occurring copper-binding tripeptide with genuinely decent evidence — as a topical skincare ingredient. The moment people start injecting it as a 'youth reset,' the evidence falls off a cliff.
What people claim
Reverses skin aging, boosts collagen, heals wounds, and (in injectable/systemic form) 'rejuvenates' the whole body.
Human evidence
Reasonable placebo-controlled and review evidence for TOPICAL use: improved skin firmness, wrinkles and skin quality. That's a real, if modest, result. There is essentially no good human evidence for injected/systemic GHK-Cu doing the sweeping 'rejuvenation' things it's sold for in stacks.
Animal evidence
Wound-healing and tissue-remodelling activity in animal and cell models underpins the mechanism story — but that's the topical/local wound context, not systemic anti-aging.
Risk flags
- Unregulated / grey-market supply
- Purity & quality unknowable
- Long-term effects unknown
- Injection & sterility risk
Regulatory status
US: Widely sold as a cosmetic skincare ingredient (topical, legal). Injectable GHK-Cu is not FDA-approved and sits in the grey market.
UK: Permitted in topical cosmetics. No authorisation for injectable/medicinal use.
What people report
Typical reported ranges — reporting, not a recommendation
For skin, it's used topically in serums at low single-digit percentages. Injectable 'reported' ranges circulate on forums but rest on no human efficacy data.
The honest harm-reduction point the founder likes: for skin, the evidence is for RUBBING IT ON — you may not need a needle at all. Injecting it chases benefits that topical data doesn't support. Reporting, not advice.
Everyone's an expert
Who says what
Gym Bros Say
"It's the GLOW in the GLOW stack. Skin, healing, all of it — pin it with your BPC."
Clinics Say
Sold for 'cellular rejuvenation' and 'youth reset' — stretching topical cosmetic evidence into systemic promises.
Reddit Says
Split: skincare people rate the topical serum; injection crowd reports post-shot itching and argues about whether systemic use does anything.
Science Actually Says
Grade C. Genuinely one of the better-evidenced compounds here — FOR TOPICAL SKIN. Injected, systemic, whole-body 'rejuvenation' claims aren't supported.
PeptideStackers Says
The rare peptide where the honest move might be the least invasive one: a serum, not a syringe. Don't let a stack talk you into injecting something the evidence only backs on your face.
Honesty section
What we still don't know
- ?Whether injected GHK-Cu does anything the topical data doesn't already cover.
- ?Long-term safety of systemic dosing (no human data).
- ?How much the copper content matters for systemic use.
Real questions people ask
FAQ
- Does GHK-Cu actually work?
- For topical skin use, the evidence is reasonably good for modest wrinkle and skin-quality improvement. For injectable, whole-body 'rejuvenation,' the evidence is not there.
- Do I need to inject copper peptide?
- For skin, no — the human evidence is for topical application. Injecting it chases systemic claims that topical data doesn't support.
Before you do anything
Questions to ask a qualified professional
- 01For my skin goal, is there any reason a topical serum wouldn't do?
- 02What evidence supports injecting this versus applying it?
- 03What's the risk of adding a copper-containing injectable to a stack?