Skin / repair
GHK-Cu
Topical: small human studies. Injected: essentially none
Cosmetic ingredient. Injectable use is unapproved.
What's actually proven
- ✓Topical creams improved skin density, fine lines and firmness in small controlled human studies.
- ✓Supports wound healing in lab and animal models.
The bullshit / overstated
- ✗"Regrows hair" — weak, mostly lab data.
- ✗Injectable 'whole-body rejuvenation' — no published human trials of injected GHK-Cu.
- ✗Gene-expression papers are computer analyses, not proof it does that in you.
Side effects
- •Injection-site pain, redness, lumps
- •Blue/green skin tint at site
- •Copper excess with high or long use
Don't use if
- !Wilson's disease or copper metabolism problems
- !Pregnancy
Typical protocol (community — not clinically tested)
Daily, 5 days on / 2 off