Best Peptide Serums and Copper Peptide Serums, Compared

The best peptide serum, on the human evidence, uses palmitoyl pentapeptide-4 (Matrixyl). It has the strongest human trial of any serum peptide: 12 weeks, placebo-controlled, in 93 women Robinson 2005 - Robinson LR, Fitzgerald NC, Doughty DG et al. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. Int J Cosmet Sci. 2005;27(3):155-60., in the references below. Olay Regenerist Micro-Sculpting Serum contains it but does not say how much. For a stated concentration, The Ordinary Argireline Solution 10% is the cheapest pick. Copper peptide (GHK-Cu) serums have the weakest evidence of the three.

Peptide serums are a large category built on a small pile of human evidence, much of it funded by the people selling the ingredient. Matrixyl and Argireline each have a placebo-controlled trial. GHK-Cu, the most famous, has weaker human data than most readers expect. Everything else sits between “mechanistically interesting” and “unstudied on skin”.

The best peptide serums compared

I picked on the five criteria below, mainly whether a serum names a peptide with human trial data and states its concentration. The evidence column is for the peptide, not the finished serum. Prices come from each seller’s own page as of 3 October 2026.

Best for the trial peptide: Olay Regenerist Micro-Sculpting Serum

Olay’s fragrance-free serum lists palmitoyl pentapeptide-4, the peptide in the 2005 split-face trial Robinson 2005 - Robinson LR, Fitzgerald NC, Doughty DG et al. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. Int J Cosmet Sci. 2005;27(3):155-60., in the references below. Olay is a Procter & Gamble brand, and P&G scientists ran that trial. Olay does not state the concentration, so you cannot check it against the trial’s 3 parts per million. That fails criterion 2, but no other serum here is closer to what was tested.

The Ordinary’s Matrixyl 10% + HA is a common substitute. Its label lists palmitoyl tripeptide-1, palmitoyl tetrapeptide-7 and palmitoyl tripeptide-38, not palmitoyl pentapeptide-4 (The Ordinary). The 2005 trial does not cover it.

Best stated concentration for the money: The Ordinary Argireline Solution 10%

It contains acetyl hexapeptide-8, sold as Argireline, which beat placebo around the eyes in a 4-week trial of 60 people Wang 2013 - Wang Y, Wang M, Xiao S et al. The anti-wrinkle efficacy of argireline, a synthetic hexapeptide, in Chinese subjects: a randomized, placebo-controlled study. Am J Clin Dermatol. 2013;14(2):147-53., in the references below. The label states 10% Argireline, a trademarked ingredient, without giving the pure peptide content. At $9.70 for 30 mL it is the cheapest serum here. The permeation review below suggests the peptide may not reach the muscle it is theorized to act on.

Best copper peptide serums

The best copper peptide serums state how much copper peptide they contain. Of the copper serums I checked, two state a plain percentage. Both are sold by DECIEM: The Ordinary Multi-Peptide + Copper Peptides 1% Serum and NIOD Copper Amino Isolate Serum 3 1:1. Copper peptides have weaker human evidence than Matrixyl or Argireline (see the GHK-Cu section below), so treat either as a low-stakes experiment.

• The Ordinary Multi-Peptide + Copper Peptides 1% Serum is the cheaper of the two, at $32 for 30 mL. It pairs 1% copper tripeptide-1 with seven other peptides, including acetyl hexapeptide-8. The Ordinary says to apply it morning and evening, and not to use it with direct acids, direct vitamin C, retinoids or strong antioxidants.
• NIOD Copper Amino Isolate Serum 3 1:1 states 1% GHK-Cu and 1% GHK (the peptide without copper), at $93 for 30 mL or $62 for 15 mL. NIOD gives its pH as 5.7 to 6.7, says to apply it morning and night, and says to avoid contact with the eyes.

Two other copper serums I checked did not make the list. Prices are as of 3 October 2026.

• Biossance Squalane + Copper Peptide Rapid Plumping Serum ($69 for 50 mL) lists copper tripeptide-1 but states no percentage.
• Allies of Skin Copper Tripeptide & Ectoin Advanced Repair Serum ($199 for 30 mL on its US store) lists “1% Copper Tripeptide Complex” but doesn’t say how much of that complex is GHK-Cu. It also costs more than twice as much per mL as NIOD.

What does a copper peptide serum do?

It delivers GHK-Cu, a copper-binding tripeptide. Its discoverer’s reviews propose that it recruits repair cells and boosts collagen Pickart 2008 - Pickart L. The human tri-peptide GHK and tissue remodeling. J Biomater Sci Polym Ed. 2008;19(8):969-88., in the references below. In people, the one randomized trial of topical GHK-Cu on this page, after laser resurfacing, found no objective improvement over control Miller 2006 - Miller TR, Wagner JD, Baack BR et al. Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin. Arch Facial Plast Surg. 2006;8(4):252-9., in the references below.

The five criteria

1. Which peptide, named on the label

Lupo 2007 - Lupo MP, Cole AL. Cosmeceutical peptides. Dermatol Ther. 2007;20(5):343-9., in the references below describes three main categories of cosmeceutical peptides: signal, neurotransmitter-affecting, and carrier. A fourth class, enzyme-inhibiting, comes from later reviews. Badilli 2025 - Badilli U, Inal O. Current Approaches in Cosmeceuticals: Peptides, Biotics and Marine Biopolymers. Polymers (Basel). 2025;17(6)., in the references below describes these as peptides that inhibit enzymes such as MMPs, and notes the work is predominantly in vitro.

The taxonomy in Errante 2020 - Errante F, Ledwoń P, Latajka R et al. Cosmeceutical Peptides in the Framework of Sustainable Wellness Economy. Front Chem. 2020;8:572923., in the references below is the one to shop with:

• Carrier - copper tripeptide-1 (GHK-Cu) and manganese tripeptide-1. Exactly two.
• Signal - palmitoyl pentapeptide-4 (Matrixyl), PKEK, GEKG, tripeptide-10 citrulline.
• Neurotransmitter-inhibiting - acetyl hexapeptide-3 (Argireline), pentapeptide-3 (Vialox), pentapeptide-18, SNAP-8.

That review notes there are no further investigations directly describing or enhancing the anti-wrinkle properties of Vialox. Count the peptides with human trials behind them, not the peptides on the label.

2. Concentration, compared against what was tested

This is where most serums fail, quietly. The strongest human trial in the category is Robinson 2005 - Robinson LR, Fitzgerald NC, Doughty DG et al. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. Int J Cosmet Sci. 2005;27(3):155-60., in the references below. It tested palmitoyl pentapeptide-4 at 3 parts per million in 93 Caucasian women aged 35-55. It was double-blind, placebo-controlled and split-face, and ran for 12 weeks. It reported significant improvement versus placebo for reduction in wrinkles and fine lines, by both quantitative technical and expert grader image analysis.

The listed affiliation is Procter & Gamble’s Miami Valley Laboratories. That is worth knowing but not disqualifying. It remains a genuine peer-reviewed, split-face, placebo-controlled trial, a study category GHK-Cu entirely lacks.

Three ppm is a tiny concentration, and “high-strength peptide” marketing is untested. What you want is a brand that states its peptide percentage at all. Most do not.

3. Is the formula plausible?

Two sub-questions, and neither is well answered.

Penetration. GHK’s molecular weight is 340.38 Da, under the threshold in the proposed 500 Dalton rule (Bos 2000 - Bos JD, Meinardi MM. The 500 Dalton rule for the skin penetration of chemical compounds and drugs. Exp Dermatol. 2000;9(3):165-9., in the references below). But that rule is a heuristic argued from three lines of circumstantial evidence, not a physical limit.

GHK’s computed properties cut the other way. An XLogP of −4.4 and a topological polar surface area of 176 Ų make it extremely hydrophilic and highly polar, and it is charged at skin pH. The stratum corneum is a lipophilic barrier. Whether that stops GHK crossing it in a real formula is an inference. I found no source measuring it.

Where permeation has been examined head-on, the literature contradicts itself. Zdrada-Nowak 2025 - Zdrada-Nowak J, Surgiel-Gemza A, Szatkowska M. Acetyl Hexapeptide-8 in Cosmeceuticals-A Review of Skin Permeability and Efficacy. Int J Mol Sci. 2025;26(12)., in the references below records two contradictory results for acetyl hexapeptide-8:

• One study reported around 30% of an applied 10% formulation penetrating a membrane in two hours.
• Another found only 0.22% penetrating the stratum corneum at 24 hours, with none detected in receptor solution.

Its authors conclude that AH-8’s ability to reach neuromuscular junctions remains uncertain. They say transdermal delivery sufficient to paralyse muscle is likely impossible. The review declared no external funding.

Incompatibilities. You may have read that copper peptides must never touch vitamin C. The published literature indexes no clinical or in vivo studies of GHK-Cu and vitamin C applied to skin together, and that null holds across several search formulations.

The caution is not pure folklore. Copper-catalysed ascorbate oxidation is real solution chemistry, and older in vitro work found that ascorbate plus a copper-tripeptide complex cleaves DNA and proteins when neither does so alone. I could not verify a primary source for either point against my citation registry, so treat both as background rationale, not findings I have checked for you.

One thing cuts against a confident warning. GHK-Cu is a chelate: the copper is bound to the peptide rather than free, and chelation materially alters copper’s redox behaviour. Extrapolating free-copper solution chemistry to GHK-Cu on skin is an inference, not a finding. No study has measured this for GHK-Cu specifically.

4. Packaging

Prefer opaque, airless pumps over dropper bottles and jars. That is standard formulation practice, not something my sources measured for peptides: I found no primary study on peptide serum stability in different packaging. Preferring the airless pump costs nothing, but don’t pay a premium for it as though it were proven.

5. Price per mL

Do the division. A 15 mL serum at $90 is $6.00/mL; a 30 mL serum at $120 is $4.00/mL. The best-supported concentration in the literature is 3 ppm, so price tracks brand and packaging far more than active ingredient. No evidence says expensive peptide serums outperform cheap ones, because nobody has run that trial.

The GHK-Cu problem

GHK-Cu is the peptide most readers arrive looking for, and the one where the gap between reputation and evidence is widest.

Loren Pickart isolated GHK in 1973 as an activity in human albumin that caused old human liver tissue to synthesize proteins like younger tissue (Pickart 2015 - Pickart L, Vasquez-Soltero JM, Margolina A. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. Biomed Res Int. 2015;2015:648108., in the references below). Pickart 2008 - Pickart L. The human tri-peptide GHK and tissue remodeling. J Biomater Sci Polym Ed. 2008;19(8):969-88., in the references below proposes four mechanisms:

• recruitment of repair cells
• anti-inflammatory action via free radical suppression
• stimulation of collagen, elastin and growth factor synthesis
• enhanced fibroblast and keratinocyte proliferation

That is the originator’s framework, not replicated consensus. Then the awkward parts:

• The three trials anchoring most consumer claims are not peer-reviewed journal articles, per the reference list of Pickart’s own 2015 review (Pickart 2015 - Pickart L, Vasquez-Soltero JM, Margolina A. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. Biomed Res Int. 2015;2015:648108., in the references below). The 71-woman facial cream study is a 2002 American Academy of Dermatology conference presentation. The 41-woman eye cream study is a 2002 University of Pennsylvania report. The 67-woman study is a 2005 book chapter. None appears to be indexed in PubMed.
• All three authors of that widely cited review share an affiliation with Skin Biology, a company that sells copper peptide products. The paper states that the authors declare no conflict of interests (Pickart 2015 - Pickart L, Vasquez-Soltero JM, Margolina A. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. Biomed Res Int. 2015;2015:648108., in the references below).
• The quoted figure that plasma GHK falls from about 200 ng/mL at age 20 to 80 ng/mL by 60 appears in that review with no reference citation.
• A randomized trial of topical GHK-Cu on CO2 laser-resurfaced skin (Miller 2006 - Miller TR, Wagner JD, Baack BR et al. Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin. Arch Facial Plast Surg. 2006;8(4):252-9., in the references below; 13 completers, blinded evaluators plus computer image analysis, 12 weeks) was negative on its objective endpoints. It found no significant reduction or resolution of post-treatment erythema, and no significant improvement in wrinkles or overall skin quality. All patients improved regardless of arm; what was absent was any between-group difference. Only the patient-reported questionnaire favored GHK-Cu (P = .04).
• The 2026 meta-analysis of 19 RCTs and 1,341 participants (Nukaly 2026 - Nukaly HY, Halawani IR, Irtaza HM et al. Oral and topical peptides for skin aging: systematic review and meta-analysis of randomized controlled trials. Front Med (Lausanne). 2026;13:1618306., in the references below) included zero GHK-Cu trials. GHK-Cu is never mentioned anywhere in that paper, so it is silent on GHK-Cu. It is not evidence against it either.

None of that proves GHK-Cu does nothing. The evidence is small, old, non-peer-reviewed or industry-linked, and largely untested to modern standards. I found no independent, non-industry group that has replicated topical GHK-Cu efficacy in a controlled trial.

What the pooled evidence actually covers

The 2026 meta-analysis (Nukaly 2026 - Nukaly HY, Halawani IR, Irtaza HM et al. Oral and topical peptides for skin aging: systematic review and meta-analysis of randomized controlled trials. Front Med (Lausanne). 2026;13:1618306., in the references below) is the best pooled summary I have, and it is mostly not about topical peptides at all. 17 of its 19 trials were oral collagen peptides or hydrolysates, covering 1,236 of the 1,341 participants, or 92% of everyone studied. The topical arm was two studies, one of Argireline and one of alpha-defensin-5/beta-defensin-3. Neither Matrixyl nor GHK-Cu was tested in any included trial.

For comparison, a 2022 systematic review of topical tretinoin (Sitohang 2022 - Sitohang IBS, Makes WI, Sandora N et al. Topical tretinoin for treating photoaging: A systematic review of randomized controlled trials. Int J Womens Dermatol. 2022;8(1):e003., in the references below) covered 7 randomized trials and 739 subjects. All studies consistently found tretinoin efficacious for the clinical appearance of photoaging, in wrinkling, mottled hyperpigmentation, sallowness and lentigines. Improvements appeared after 4 months and persisted to 24 months, across concentrations of 0.025%–5%.

That is the shape of the decision. Peptides are adjuncts. A retinoid is the intervention.

Buyer’s guide

For the peptide with the best human trial behind it, look for palmitoyl pentapeptide-4 (Matrixyl), and check whether the brand discloses a concentration.

If you want a wrinkle-relaxing peptide, acetyl hexapeptide-3 (Argireline) has a randomized placebo-controlled trial in 60 Chinese subjects, twice-daily peri-orbital, 4 weeks (Wang 2013 - Wang Y, Wang M, Xiao S et al. The anti-wrinkle efficacy of argireline, a synthetic hexapeptide, in Chinese subjects: a randomized, placebo-controlled study. Am J Clin Dermatol. 2013;14(2):147-53., in the references below). Total anti-wrinkle efficacy was 48.9% versus 0% in placebo, with reduced roughness (p < 0.01). That is one small 4-week trial, and the permeation review above suggests it may not reach the target it is theorized to act on.

If you specifically want GHK-Cu, buy it knowing the evidence picture above. The human data people assume it has are not there.

If your goal is photoaging, the trial evidence favors a retinoid over a peptide serum by a wide margin.

If marketing says a peptide modulates thousands of genes, I could not verify any primary source for the figure, though it is widely repeated. It traces to gene-expression signature work in cultured cells, restated across the ingredient proponent’s own review series, not to a skin outcome. Treat it as an unsourced number until someone produces the measurement behind it.

What I could not answer

• Whether GHK-Cu penetrates intact human skin in a finished formula. The molecular weight is permissive, the polarity is not, and I found no measurement.
• Whether GHK-Cu and vitamin C interact on skin. Untested either way.
• Whether packaging changes peptide serum stability. Plausible, unmeasured in my sources.
• Whether any finished serum outperforms any other. No head-to-head trials exist.
• What concentration of GHK-Cu, at what pH, is needed for any effect. Products range widely with no human dose-response data.

Common questions

What is the best peptide serum?

There is no single winner on the evidence. The peptide with the strongest human trial is palmitoyl pentapeptide-4 (Matrixyl): a 12-week split-face trial in 93 women reported significant wrinkle reduction versus placebo. Procter and Gamble scientists wrote it. Olay Regenerist Micro-Sculpting Serum contains it but does not state how much. For a stated concentration, The Ordinary Argireline Solution 10% is the cheapest pick.

Do peptide serums actually work?

Some peptides have modest trial support. Palmitoyl pentapeptide-4 reduced wrinkles versus placebo over 12 weeks in 93 women, and Argireline beat placebo over 4 weeks in 60 people. A 2026 meta-analysis of 19 peptide trials found only two topical ones, so the evidence base is small. A retinoid has much stronger trial support for photoaging.

What is the most reputable peptide brand?

Reputation is not something a trial measures, so check the label instead. A serum worth considering names its peptide, states a concentration you can compare with the tested one, and avoids drug claims such as stimulating collagen. Among the serums on this page, The Ordinary and NIOD state concentrations; Olay names palmitoyl pentapeptide-4 but not its amount.

Does GHK-Cu copper peptide actually work?

The published human evidence is much thinner than the marketing suggests. A randomized trial in laser-resurfaced skin found no significant improvement in wrinkles or overall skin quality versus control on objective measures. A 2026 meta-analysis of 19 peptide trials included no GHK-Cu trials. It never mentions GHK-Cu, so it is silent on the ingredient rather than evidence against it. The three studies most often cited for GHK-Cu were a conference presentation, a university report, and a book chapter, not peer-reviewed journal articles.

What percent copper peptide is best?

Nobody knows. I found no human dose-response data for topical GHK-Cu, so no percentage has been shown to work better than another. The copper serums on this page state 1%, which at least lets you compare them.

How often should I use copper peptide serum?

Both copper serums on this page tell you to apply them in the morning and evening. No human trial has tested how often to use one, so that is what the sellers say rather than a tested schedule.

What are the downsides of copper peptides?

The main downside is paying for thin evidence. Cosmetics can still irritate: The Ordinary advises a patch test and stopping if irritation occurs, and NIOD says to avoid contact with the eyes. I found no measurement of whether GHK-Cu crosses intact skin in a finished serum.

What should you not mix with copper peptides?

The Ordinary says not to use its copper serum with direct acids, direct vitamin C, EUK, retinoids or strong antioxidants. That is the seller's guidance rather than a tested rule. For vitamin C, the best-known warning, the published literature indexes no clinical study of the two applied to skin together. Using them at different times of day is a cheap hedge.

Are copper peptides good for the skin under the eyes?

I found no peer-reviewed evidence for it. The eye-cream study often cited for GHK-Cu, in 41 women, is a 2002 university report rather than a journal article. NIOD tells users of its copper serum to avoid contact with the eyes.

Can you use a peptide serum with vitamin C?

Nobody knows. The published literature indexes no clinical or in vivo studies of topical GHK-Cu combined with vitamin C on skin. Copper and ascorbate redox chemistry in solution gives the caution a mechanistic rationale. But it has never been tested on skin, and GHK-Cu binds its copper rather than leaving it free. The Ordinary tells users not to combine its peptide serums with direct vitamin C. Separating them into morning and evening routines is a cheap hedge, not an evidence-based rule.

How much peptide should a serum contain?

More is not automatically better, and the tested concentration is what matters. The Matrixyl trial that anchors most peptide claims used palmitoyl pentapeptide-4 at 3 parts per million, which is a very small amount. Most brands do not disclose their peptide concentration at all, which makes it impossible to tell whether a formula matches anything that was studied.

Are peptide serums better than retinoids?

The evidence does not support that. A 2022 systematic review of topical tretinoin covered 7 randomized trials and 739 subjects, all reporting improvement in the clinical appearance of photoaging. No cosmetic peptide has a comparable body of trial evidence. Peptides are best thought of as adjuncts to a routine, not replacements for a retinoid.

Are peptide serums FDA approved?

No. Cosmetics are not FDA-approved before sale. Under US law a cosmetic is something applied to the body for cleansing, beautifying, promoting attractiveness, or altering the appearance. A product intended to affect the structure or function of the body is a drug. Both definitions turn on intended use rather than on ingredients, and neither definition mentions peptides.

References (22 sources)

Show

Bibliographic detail is fetched from PubMed, not written by me - so a citation here cannot drift from the paper it names. Study design comes from PubMed's own tags rather than my judgement.

1. 1.Bos JD, Meinardi MM. The 500 Dalton rule for the skin penetration of chemical compounds and drugs. Exp Dermatol. 2000;9(3):165-9.ReviewPMID 10839713
2. 2.Robinson LR, Fitzgerald NC, Doughty DG et al. Topical palmitoyl pentapeptide provides improvement in photoaged human facial skin. Int J Cosmet Sci. 2005;27(3):155-60.StudyPMID 18492182
3. 3.Wang Y, Wang M, Xiao S et al. The anti-wrinkle efficacy of argireline, a synthetic hexapeptide, in Chinese subjects: a randomized, placebo-controlled study. Am J Clin Dermatol. 2013;14(2):147-53.Randomised trialPMID 23417317
4. 4.Miller TR, Wagner JD, Baack BR et al. Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin. Arch Facial Plast Surg. 2006;8(4):252-9.Randomised trialPMID 16847171
5. 5.Nukaly HY, Halawani IR, Irtaza HM et al. Oral and topical peptides for skin aging: systematic review and meta-analysis of randomized controlled trials. Front Med (Lausanne). 2026;13:1618306.Systematic reviewPMID 41924746full text
6. 6.Pickart L, Vasquez-Soltero JM, Margolina A. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. Biomed Res Int. 2015;2015:648108.ReviewPMID 26236730full text
7. 7.Pickart L. The human tri-peptide GHK and tissue remodeling. J Biomater Sci Polym Ed. 2008;19(8):969-88.ReviewPMID 18644225
8. 8.Lupo MP, Cole AL. Cosmeceutical peptides. Dermatol Ther. 2007;20(5):343-9.ReviewPMID 18045359
9. 9.Errante F, Ledwoń P, Latajka R et al. Cosmeceutical Peptides in the Framework of Sustainable Wellness Economy. Front Chem. 2020;8:572923.ReviewPMID 33195061full text
10. 10.Badilli U, Inal O. Current Approaches in Cosmeceuticals: Peptides, Biotics and Marine Biopolymers. Polymers (Basel). 2025;17(6).ReviewPMID 40292641full text
11. 11.Zdrada-Nowak J, Surgiel-Gemza A, Szatkowska M. Acetyl Hexapeptide-8 in Cosmeceuticals-A Review of Skin Permeability and Efficacy. Int J Mol Sci. 2025;26(12).ReviewPMID 40565185full text
12. 12.Sitohang IBS, Makes WI, Sandora N et al. Topical tretinoin for treating photoaging: A systematic review of randomized controlled trials. Int J Womens Dermatol. 2022;8(1):e003.ReviewPMID 35620028full text
13. 13.PubChem Compound Summary CID 73587 (GHK) - computed physicochemical properties- National Library of Medicinedatabase
14. 14.21 U.S.C. §321 - FD&C Act definitions of 'cosmetic' (§321(i)) and 'drug' (§321(g)(1))- Legal Information Institute, Cornell Law Schoolstatute
15. 15.Olay Regenerist Micro-Sculpting Serum Fragrance Free product page: ingredient list includes palmitoyl pentapeptide-4, no concentration stated; 1.7 oz for $36.65 (checked 3 October 2026)- Olay, seller pageother
16. 16.P&G brands list, showing Olay as a Procter & Gamble skin care brand (checked 3 October 2026)- Procter & Gambleother
17. 17.The Ordinary Argireline Solution 10% product page: acetyl hexapeptide-8 (Argireline, a Lipotec trademark); 30 mL for $9.70; do not use with direct acids or direct vitamin C (checked 3 October 2026)- The Ordinary (DECIEM), seller pageother
18. 18.The Ordinary Matrixyl 10% + HA product page: lists palmitoyl tripeptide-1, palmitoyl tetrapeptide-7 and palmitoyl tripeptide-38; 30 mL for $10.90 (checked 3 October 2026)- The Ordinary (DECIEM), seller pageother
19. 19.The Ordinary Multi-Peptide + Copper Peptides 1% Serum product page: 1% copper tripeptide-1 plus other peptides; 30 mL for $32; apply morning and evening; do not use with direct acids, direct vitamin C, retinoids or strong antioxidants (checked 3 October 2026)- The Ordinary (DECIEM), seller pageother
20. 20.NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) product page: 1% GHK-Cu and 1% GHK; 15 mL for $62, 30 mL for $93; pH 5.7-6.7; apply morning and night, avoid contact with eyes (checked 3 October 2026)- NIOD (DECIEM), seller pageother
21. 21.Biossance Squalane + Copper Peptide Rapid Plumping Serum product page: copper tripeptide-1 listed, no percentage stated; 50 mL for $69 (checked 3 October 2026)- Biossance, seller pageother
22. 22.Allies of Skin Copper Tripeptide & Ectoin Advanced Repair Serum, US store product page: ingredients begin 2% Copper Lysinate Complex, 2% Acetyl Hexapeptide-8 Complex, 1% Copper Tripeptide Complex, 2% Ectoin; 1 fl oz for $199 (checked 3 October 2026)- Allies of Skin (US store), seller pageother

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