GHK-Cu is one of the more thoroughly studied ingredients in skincare, and unlike most cosmetic actives, it wasn't invented in a lab for that purpose. Here's where it comes from, what it does, and how to make sense of it on a label.
A Peptide Discovered in the Body, Not the Lab
GHK-Cu (copper tripeptide-1) was first identified in human blood plasma in the 1970s, where researchers noticed it played a role in tissue repair. Plasma levels of GHK-Cu are highest in youth and decline steadily with age — which is part of why it drew interest for skin applications in the first place.
What It Does at the Cellular Level
GHK-Cu is classed as a carrier peptide: it helps deliver copper to skin cells, supporting enzymatic processes involved in tissue remodelling. Research indicates it can help regulate the balance between matrix metalloproteinases (enzymes that break down collagen) and their natural inhibitors, which is part of how it's thought to support the skin's structural proteins over time. It's also documented to have antioxidant and anti-inflammatory activity.
The Evidence: Collagen, Repair, and Beyond
Laboratory studies have measured increases in collagen production of up to 70% with GHK-Cu at low concentrations. Separately, decades of wound-healing research — largely in animal models — show it accelerating wound closure, improving skin-graft integration, and increasing formation of new blood vessels. Some clinical trials on topical copper peptide formulations have shown results comparable to established dermatological treatments for visible signs of ageing, though study sizes in this area are often modest.
Reading a GHK-Cu Label
This is where it gets confusing: most suppliers source copper tripeptide-1 as a pre-diluted 1% solution, so a product listing “1% GHK-Cu” often contains only a fraction of that as the actual active peptide. Our Renewal Serum is formulated at 0.2% pure copper tripeptide-1 — not a diluted-solution percentage, the real number — paired with CoEnzyme Q10 and niacinamide. For a closer look at how to spot pre-diluted percentages on any copper peptide label, see our guide on how to read a GHK-Cu serum label.
Who It's For
GHK-Cu is generally well tolerated, including by skin that reacts to stronger actives like retinoids, though as with any new active it's worth patch-testing first. It works at low concentrations, so more isn't necessarily better — a couple of drops, applied to clean skin morning or night, is the standard approach.
For the wider category, see our overview of topical peptides in skincare.
Frequently Asked Questions
What is GHK-Cu?
GHK-Cu, or copper tripeptide-1, is a copper-binding peptide naturally present in the body. In skincare, it's used topically for its studied role in supporting collagen and elastin production and aiding tissue repair.
How much GHK-Cu should a serum contain?
There isn't a single, publicly disclosed "ideal" percentage backed by the most-cited clinical trials — those trials tested finished, proprietary formulations and didn't publish the exact concentration used. What matters more than chasing a specific number is checking whether a product states its percentage as pure peptide or as a diluted solution — as explained above, those are very different numbers, and the distinction tells you more than the number alone.
Is GHK-Cu safe for sensitive skin?
GHK-Cu is generally well tolerated, including by skin that reacts to stronger actives like retinoids. As with any new active, patch-test first, and discontinue use if irritation occurs.
Can I use GHK-Cu with other actives, like retinol?
GHK-Cu is often used alongside other actives, but as a general rule, introduce new products one at a time so you can tell what's actually working — and what isn't agreeing with your skin. If you're combining it with a strong active like retinol, consider alternating nights rather than layering both at once.
How long does it take to see results from GHK-Cu?
Collagen remodelling is a gradual process, not an overnight one. Most research on topical copper peptides tracks results over weeks to months of consistent use, not days — which is consistent with how skincare actives generally work.
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