Last updated: August 2026
GHK-Cu (copper tripeptide-1) is the flagship copper peptide, and it is the one people specifically search out by name. We tested the serums that lead with GHK-Cu and ranked them on how clearly the formula is disclosed, how it feels, and whether the price is fair. New to the ingredient? Read the GHK-Cu guide first, or the broader copper peptides hub.
GHK-Cu is one of the best-characterised peptides in cosmetic science. It was first isolated from human plasma in the 1970s and is unusual in acting as both a signal peptide and a carrier of copper: the copper is the point, not a contaminant. In cosmetic use that means a gradual, appearance-level payoff for the look of firmness and tone, which is why a well-formulated serum used consistently beats a flashy one used sporadically.
What to look for in a GHK-Cu serum
- Copper tripeptide-1 named on the label. A serum marketed as GHK-Cu should list “copper tripeptide-1” on its INCI list, not just a generic “peptide complex.” Genuine copper peptides give a formula a faint blue tint.
- A disclosed concentration where possible. Cosmetic GHK-Cu serums commonly sit in the region of roughly 0.5% to 2%, though brands disclose this inconsistently. There is no universally “correct” figure: a transparent brand is more reassuring than a big number.
- A supportive base. Humectants (glycerin, hyaluronic acid) help the serum feel good and layer well; heavy fragrance and lots of essential oils add irritation risk without benefit.
- Layer-friendly texture. You want something that sits comfortably under moisturiser and sunscreen, because daily use over months is what matters.
- Vitamin C strategy. Keep GHK-Cu out of the same routine as direct L-ascorbic acid; most people run vitamin C in the morning and GHK-Cu at night.
How we scored them
We want the peptide named clearly, a sensible supporting formula, and a texture that layers under sunscreen. Each serum was used for several weeks and scored on formula transparency, feel and value. These are SerumScience editorial scores from hands-on use, not scraped star counts: see how we test.
The shortlist at a glance
Prices move constantly, so we link out to check the current price. Here is how the six picks compare:
| Serum | Best for | Rating | Key trait |
|---|---|---|---|
| NIOD Copper Amino Isolate Serum 3:1 | Best overall | 4.7 | Most GHK-Cu-forward serum on test |
| Paula's Choice Pro-Collagen Multi-Peptide Booster | Best all-rounder | 4.5 | Mix into moisturiser or layer alone |
| Medik8 Liquid Peptides | Best high-strength | 4.5 | Copper GHK plus a broad peptide matrix |
| The Ordinary Multi-Peptide + HA Serum | Best value | 4.3 | Accessible copper-adjacent peptides |
| Isntree Copper Peptide Serum | Best Korean / K-beauty | 4.3 | Lightweight, humectant-rich K-beauty base |
| Timeless CopperPeptide + HA Serum | Best for sensitive skin | 4.3 | Short, fragrance-free ingredient list |
How the picks compare
If copper tripeptide-1 is specifically what you want, the NIOD remains the cleanest expression of it and our overall pick: focused, fast-absorbing and transparent, if minimalist and premium. Paula’s Choice is the most flexible option: a fragrance-free booster you can mix into moisturiser or layer alone, which makes it a great all-rounder even though it is a blend rather than GHK-Cu only. Medik8 is the step up in strength, combining copper with a wider peptide matrix for people who want more in one bottle.
For value, The Ordinary is still the sensible, low-risk way to try copper-adjacent peptides without overspending: just know it is a multi-peptide blend, not a dedicated GHK-Cu serum. Timeless keeps its formula short and fragrance-free for reactive skin, and the Isntree is our K-beauty pick for anyone who prioritises texture and layering feel.
Best GHK-Cu serum by concentration and brand
People often search for the “strongest” or “highest-concentration” GHK-Cu serum, so it is worth setting expectations. Cosmetic GHK-Cu is typically formulated in the region of 0.5% to 2%; going higher is not automatically better, because copper peptides work through signalling rather than brute dose, and very high loads can compromise texture and stability. If a high copper load is your priority, our high-strength pick (Medik8) leans that way while keeping the formula usable, and the NIOD’s concentrated amino-isolate approach is the most copper-forward on test.
On the “best GHK-Cu company” question: the brands worth trusting are the ones that name copper tripeptide-1 explicitly, disclose a concentration where they can, and keep the supporting formula clean. Reputation helps, but a transparent label matters more than a familiar logo. Every pick on this list clears that bar.
How to use and layer a GHK-Cu serum
Apply GHK-Cu after your water-based serums and before moisturiser. The single rule worth remembering is to keep it out of the same routine as direct L-ascorbic acid (strong vitamin C): the easy split is vitamin C in the morning and GHK-Cu at night. We explain why in copper peptides and vitamin C and in the full peptide, vitamin C and retinol layering guide.
Give a GHK-Cu serum 8 to 12 weeks of consistent use before judging it: cosmetic changes are gradual. Take a photo at the start, wear sunscreen daily, and grade the trend. For the ingredient science, our GHK-Cu hub has the detail.
The bottom line
The NIOD is the GHK-Cu serum to buy if you want the ingredient in its most focused form. Paula’s Choice is the most flexible, Medik8 the strongest, The Ordinary the cheapest sensible start, and Timeless or Isntree the picks for sensitive skin and K-beauty texture respectively. As always, consistency and daily sunscreen do more for your results than any single bottle.