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References: 6 · Serums compared: 4 · Prices checked Oct 10, 2026 · Status as of Oct 10, 2026
Jump to: The ranking · How we ranked · The four serums · What the evidence says · Pairing and the "copper uglies" · Common questions
"The Ordinary is the only one that tells the percentage." A reader said that in a skincare thread, and it explains why we built this ranking. Copper peptide serums are booming, and the labels vary a lot in what they reveal.
The ranking
| Rank | Serum | What the label states | Size and price | Price per mL | Buy |
|---|---|---|---|---|---|
| Rank1 | SerumNIOD Copper Amino Isolate Serum 3 1:1Best overall | What the label states 1% GHK-Cu + 1% GHK | Size and price15 mL, $62 | Price per mL$4.13 | Buy |
| Rank2 | SerumCOSRX The Blue Peptide Bakuchiol Plump Glow SerumBest value | What the label states Copper peptide 0.5% (named as GHK-Cu) + bakuchiol 0.25% | Size and price50 mL, $27 | Price per mL$0.54 | BuyNot linked |
| Rank3 | SerumThe Ordinary Multi-Peptide + Copper Peptides 1% Serum | What the label statesCopper peptides 1% in the name; GHK-Cu listed in the formula, share not broken out | Size and price30 mL, $32 | Price per mL$1.07 | Buy |
| Rank4 | SerumPeach & Lily Copper Peptide Pro Firming Serum | What the label statesCopper peptide 0.2%; Copper Tripeptide-1 in the ingredient list | Size and price30 mL, $49 | Price per mL$1.63 | BuyNot linked |
Prices from each brand's US site, October 10, 2026 (ET). All four publish a full ingredient list.
How we ranked
We gave the top spots to serums that state how much GHK-Cu (INCI name: Copper Tripeptide-1) they contain. Next came serums that state a copper peptide percentage without saying which peptide or how much of the blend it is. Ties went to the lower price per mL. We also recorded pairing warnings on each brand's page. We did not test any serum, and we do not rank on results, because no published trial compares these products.
The four serums
1. NIOD Copper Amino Isolate Serum 3 1:1: most disclosed
NIOD states 1% GHK-Cu and 1% GHK (the peptide without copper) in its current formula. It is the most specific label we found. At $62 for 15 mL, it is also the most expensive per mL here. The US product page also lists a 30 mL size. We could not confirm a separate price for that size, so this page uses the 15 mL price only. NIOD's own claims about results come from its brand testing, not a published trial.
2. COSRX The Blue Peptide Bakuchiol Plump Glow Serum: best value with a stated amount
COSRX lists copper peptide 0.5% (5,000 ppm), names it as Copper Tripeptide-1 (GHK-Cu), and adds 0.25% bakuchiol, a plant compound marketed as a retinol alternative. 50 mL for $27 is the lowest price per mL on our list. If you already use a retinoid, note the bakuchiol.
3. The Ordinary Multi-Peptide + Copper Peptides 1%: the one readers name
The name says 1% copper peptides, and The Ordinary says the formula contains GHK-Cu along with several other peptides. The brand page does not define what that 1% measures, and it does not say how much of the 1% is GHK-Cu. It gives the clearest pairing warning of the four: do not use with direct acids, direct vitamin C, EUK, retinoids, strong antioxidants, resveratrol and ferulic acid, or salicylic acid. The brand advises a patch test. Our GHK-Cu side effects page covers the irritation reports.
4. Peach & Lily Copper Peptide Pro Firming Serum
Peach & Lily states "0.2% copper peptide," and Copper Tripeptide-1 appears sixth in the ingredient list among about a dozen other peptides. 30 mL for $49.
Read this next GHK-Cu research profile
Not ranked: Medik8 sells peptide serums, but we did not find a Medik8 serum with a stated GHK-Cu percentage on its site on October 10, 2026. Other brands' percentages that we saw only on competitors' comparison charts are left out until we can confirm them on the brand's own page.
What the evidence says
GHK-Cu creams and gels have been tested in a handful of small human studies, mostly in wound healing, plus decades of laboratory work. Our GHK-Cu profile grades each study. For the anti-aging claims on serum boxes, most of the research so far comes from laboratory and animal studies. That does not tell us whether it works in people.
No published trial has compared these four serums, or tested whether 1% beats 0.2%. A clear label tells you what you are paying for. It does not prove results.
Pairing and the "copper uglies"
- Pairing. Readers ask whether copper peptides clash with retinol, vitamin C and acids. We did not find reliable interaction data in the sources reviewed. That does not mean there are no interactions. Follow each brand's pairing guidance, such as The Ordinary's "do not use with" list.
- Patch-test. Try a new serum on a small area for a few days first.
- The "copper uglies." A Reddit term for skin looking worse after starting copper peptides. We found no study that measured it. See GHK-Cu side effects.
- Injectable GHK-Cu is a different product. It is not a cosmetic and is not FDA approved. See is GHK-Cu FDA approved?.
Common questions
What is the best copper peptide serum?
On disclosure, NIOD Copper Amino Isolate Serum 3 1:1, which states 1% GHK-Cu and 1% GHK. On value, COSRX The Blue Peptide serum, which states 0.5% GHK-Cu at $27 for 50 mL. No trial has compared them.
Is The Ordinary copper peptide serum good?
It states 1% copper peptides and lists GHK-Cu in the formula, though not how much of the 1% is GHK-Cu. It costs $32 for 30 mL and comes with a clear list of products not to combine it with.
Is a higher percentage of GHK-Cu better?
Not proven. No published trial has compared serum strengths. Patch-test any new serum, whatever its percentage.
Can I use copper peptides with retinol or vitamin C?
We found no controlled study of these combinations. The Ordinary advises against using its copper serum with retinoids and direct vitamin C. The label comparison is copper peptides vs retinol. Follow the label for the product you use.
What are the "copper uglies"?
A Reddit term for skin looking worse after starting copper peptides, such as dullness or breakouts. No study has measured it.
What does Copper Tripeptide-1 mean on a label?
It is the ingredient-list (INCI) name for GHK-Cu. If a label shows Copper Tripeptide-1 but no percentage, the product contains GHK-Cu in an undisclosed amount.
Sources, methodology, and changes
Methodology. On October 10, 2026 we read each serum's US brand page for the stated copper peptide percentage, full ingredient list, size, price and pairing guidance. Literature summary from our existing GHK-Cu pages (search date 2026-10-10). We did not test any product. Reader quotes come from Reddit threads collected for our reader research.
Primary sources.
- NIOD Copper Amino Isolate Serum 3 1:1: https://niod.com/en-us/copper-amino-isolate-serum-3-11-cais3-serum-100368.html
- COSRX The Blue Peptide Bakuchiol Plump Glow Serum: https://www.cosrx.com/products/cosrx-the-blue-peptide-bakuchiol-plump-glow-serum
- The Ordinary Multi-Peptide + Copper Peptides 1% Serum: https://theordinary.com/en-us/multi-peptide-copper-peptides-1-serum-100625.html
- Peach & Lily Copper Peptide Pro Firming Serum: https://www.peachandlily.com/products/copper-peptide-pro-firming-serum
- Straight Up Peptides, GHK-Cu profile and GHK-Cu side effects
- FDA, bulk drug substances that may present significant safety risks (GHK-Cu): https://www.fda.gov/drugs/human-drug-compounding/certain-bulk-drug-substances-use-compounding-may-present-significant-safety-risks
Changes. Oct 10, 2026: first published.
