Copper peptide · legal, sold OTC

GHK-Cu, the copper peptide, explained

GHK-Cu is the most-studied peptide in skincare — a tiny copper-carrying tripeptide your body makes naturally, and loses with age. Here’s what it really does, what the evidence shows, and how to use it.

What is GHK-Cu?

GHK-Cu (also written copper tripeptide-1) is a chain of three amino acids — glycine, histidine and lysine — bound to a single copper ion. Your body produces it naturally: levels are high in youth and fall sharply with age, which is part of why skin heals more slowly and thins over time. In skincare it’s used to top that signal back up.

What GHK-Cu does

It works through three overlapping routes:

  • Signalling: it tells fibroblasts (your skin’s builder cells) to ramp up collagen, elastin and glycosaminoglycan production.
  • Carrier: it delivers copper, a trace element that key skin-repair enzymes depend on.
  • Remodelling: it helps tidy up damaged tissue and supports wound healing and skin renewal.

In clinical and lab studies, GHK-Cu has been shown to improve skin firmness, thickness, texture and the appearance of fine lines and photodamage with consistent use. It’s a genuine standout among cosmetic peptides — the evidence base is unusually good for a skincare ingredient.

How to use a copper-peptide serum

  • Apply to clean skin, before heavier creams and oils. A pea-sized amount for the whole face is plenty.
  • Give it 8–12 weeks of daily use — collagen change is gradual.
  • Be cautious layering it directly with strong vitamin C or acids in the same step; many people use copper peptides in one part of the day and vitamin C or a retinoid in the other.
  • Always finish the morning with sunscreen — it protects the collagen you’re working to build.

Recommended GHK-Cu serums

Two of the best-reviewed copper-peptide serums — a simple, higher-strength option and a popular budget pick:

Asterwood Copper Peptides (GHK-Cu) Serum A straightforward, higher-strength copper-peptide face serum — a simple way to try GHK-Cu. View on Amazon → The Ordinary Multi-Peptide + Copper Peptides 1% A popular, budget-friendly serum pairing copper peptides with a broader peptide complex. View on Amazon →

Browse more copper-peptide serums on Amazon →

As an Amazon Associate, Chemdu may earn a commission from qualifying purchases, at no extra cost to you. These are example products for convenience, not medical or personal endorsements.

Safety & what to expect

Topical GHK-Cu is very low-risk for most people. It can leave a faint blue-green tint (that’s the copper) which rinses away. Manage expectations: think smoother, firmer-looking skin over months — a support ingredient alongside retinoids, vitamin C and SPF, not a replacement for them. Patch-test first if your skin is reactive.

Frequently asked questions

It signals skin cells to make more collagen and elastin, helps remodel damaged tissue, and delivers copper that skin-repair enzymes need. Studies show improved firmness, texture and the look of fine lines with consistent use.
Because it works by nudging your own collagen production, expect gradual change over roughly 8–12 weeks of daily use rather than overnight results.
Copper peptides layer well, but many people separate GHK-Cu from strong vitamin C (one morning, one night) since high acidity can interfere. GHK-Cu by day with a retinoid at night is a common, well-tolerated routine.
Topical copper peptides are regulated as cosmetics, sold over the counter, and considered very low-risk for most people. Patch-test first if your skin is sensitive.

Related reading

Best copper peptide serum → GHK-Cu vs Matrixyl → Peptides vs retinol →

Not medical advice. Chemdu is an educational resource. This page is general information, not a recommendation for any specific product. Patch-test new skincare and consult a dermatologist for persistent skin concerns.