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Peptides in skincare are short chains of amino acids, the same building blocks that make up skin proteins such as collagen and elastin. On a label they show up under names like Copper Tripeptide-1 or Palmitoyl Tripeptide-1, and each one is designed to send a specific message to skin. Used consistently, the right peptide can help skin look firmer, smoother and visibly less lined.
I have formulated with peptides for more than 20 years. This guide gives you what most peptide articles leave out: the exact INCI names, the use rates the ingredient makers publish, and how to tell from a label how much peptide you are really getting.
Key facts
- Peptides are commonly grouped into four types: signal, carrier, neurotransmitter-modulating and enzyme-inhibitor peptides (Pintea et al., 2025).
- The peptides covered here go in the water phase: Matrixyl 3000 is listed as water soluble (Sederma data sheet), and so is copper peptide solution (Lotioncrafter).
- Supplier use rates refer to the raw-material solution, not pure peptide: 3% for Matrixyl 3000 (Sederma) and 2 to 10% for Argireline peptide solution (Lubrizol).
- A copper peptide (Copper Tripeptide-1) solution is meant for a final formula pH of 5 to 7 (Lotioncrafter).
- Molecules under about 500 Da tend to pass through skin more easily, and poor permeability is a known limit for many peptides (Pintea et al., 2025).
- On a US label, ingredients at 1% or less may be listed in any order (21 CFR 701.3).
What are peptides in skincare?
A peptide is a short chain of amino acids linked together. Proteins are long chains. Skin peptides are short enough to be made to a precise amino acid sequence, so a formulator can choose one that matches a fragment of a skin protein or a messenger molecule.
Many cosmetic peptide names start with a prefix such as Palmitoyl or Acetyl. Sederma, for example, describes Matrixyl 3000 as two "palmitoylated" peptides (Sederma data sheet). Those prefixes are part of the INCI name, which is the standard ingredient name printed on the label. That INCI name is the only reliable way to know which peptide you are buying, because trade names like Matrixyl or Argireline belong to the supplier, not to the molecule.
What do peptides do for skin?
It depends on the type. A 2025 review in Biomolecules sorts skincare peptides into four groups by how they are meant to act (Pintea et al.). A 2023 review in Cosmetics uses the same four groups (Ngoc et al.), and so does a 2017 review by Schagen (Schagen).
Be clear about the evidence. The 2025 review states that most peptide data come from laboratory work rather than human trials. The 2017 review adds that many clinical studies used peptides inside multi-ingredient products, used small groups, and in some cases were never published in journals. That does not mean peptides do nothing. It means you should look at who ran each study and how many people were in it, which is why I list those details below.
The four types of skincare peptides
1. Signal peptides: Matrixyl 3000
INCI: Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7 (supplier: Sederma).
In laboratory research, signal peptides are described as prompting skin cells called fibroblasts to make more collagen and elastin (Pintea et al.). Sederma describes Matrixyl 3000 as two palmitoylated matrikines, small messenger peptides, and recommends 3% of the raw material (Sederma data sheet). A US raw-material distributor lists 3 to 8% (Lotioncrafter).
The study: Sederma, the maker, ran a study with 23 women aged 42 to 67. Each applied a 3% Matrixyl 3000 cream to one half of the face and a placebo cream to the other, twice a day for 2 months. Sederma measured the results by profilometry, cutometry and photography. After 2 months, the Matrixyl side showed a 39.4% drop in the surface occupied by deep wrinkles against the starting point, while the placebo side's 4.3% change was not significant. These are supplier-run studies with small groups.
Read the full breakdown in our Matrixyl peptide guide.
2. Carrier peptides: GHK-Cu
INCI: Copper Tripeptide-1.
Carrier peptides deliver trace minerals such as copper to skin (Pintea et al.). GHK is a three-amino-acid sequence (glycine, histidine, lysine) that occurs naturally in human plasma. A review by Pickart and Margolina reports plasma levels of about 200 ng/mL at age 20 and about 80 ng/mL by age 60 (Pickart and Margolina, 2018).
The study: That same review cites a 12-week facial cream study in 71 women that reported fewer visible fine lines and shallower-looking wrinkles. Keep in mind that this study is cited to a conference abstract, not a full journal paper, and that both review authors list their affiliation as Skin Biology R&D.
Formulator notes: A copper peptide raw-material listing states it is water soluble, suggests a final formula pH of 5 to 7, and warns against adding chelators such as EDTA or fruit acids to the same formula (Lotioncrafter). Our GHK-Cu Copper Peptide Serum contains 1% GHK-Cu from raw material of 99.7%+ purity. Go deeper in our GHK-Cu copper peptide guide.
3. Neurotransmitter-modulating peptides: Argireline
INCI: Acetyl Hexapeptide-8 (supplier: Lubrizol/Lipotec). You may still see the older name, Acetyl Hexapeptide-3, in research papers.
In laboratory research, this peptide resembles one end of SNAP-25, a protein that nerve endings use to release the messenger acetylcholine (Pintea et al.). On skin, the measured outcome is the look of expression lines, such as crow's feet and forehead lines. Lubrizol recommends 2 to 10% of its Argireline peptide solution, whose INCI list starts with water (Lubrizol).
The studies: The 2025 review cites Blanes-Mira and colleagues, who used a 10% Argireline emulsion for 30 days and reported wrinkle depth reduced by up to 30%. The 2017 review reports a 43-woman study where wrinkle reduction measured 16.26% for Acetyl Hexapeptide-3 alone, 11.64% for Pentapeptide-18 (Leuphasyl) alone, and 24.62% for the two together (Schagen). Leuphasyl's INCI is Aqua, Glycerin, Pentapeptide-18, Caprylyl Glycol (Lubrizol via SpecialChem). See our expression line peptides guide for Snap-8, Syn-Ake and the rest of this family.
4. Enzyme-inhibitor peptides: Relistase
INCI: Glycerin, Acetylarginyltryptophyl Diphenylglycine (supplier: Lubrizol).
Enzyme-inhibitor peptides are designed to slow the enzymes that break down skin proteins, such as matrix metalloproteinases (MMPs) (Pintea et al.). Lubrizol describes Relistase as a tetrapeptide that inhibits elastase in laboratory studies (Lubrizol via SpecialChem). The research reviews also place soy and rice peptides in this group.
The evidence: This is the thinnest category. The 2017 review found little or no human data for several enzyme-inhibitor peptides (Schagen), and the Relistase information I could open covers laboratory work only. I think of this group as a supporting player, not the lead.
What are the best peptides for anti-aging?
There is no single peptide that suits everyone. Choose by what you want to see change:
- Skin that looks firmer and less lined overall: start with a signal peptide such as Matrixyl 3000, or a carrier peptide such as GHK-Cu.
- Expression lines around the eyes and forehead: look at neurotransmitter-modulating peptides such as Acetyl Hexapeptide-8.
- A broader approach: combine types. The 43-woman study above found two expression line peptides together scored higher than either alone (Schagen), and the 2025 review notes growing use of formulas with two or more peptides.
Then judge the product on three things: does it name the INCI, does it state a concentration, and does that concentration match the supplier's published range.
How to read peptide concentration on a label
This is where most shoppers get misled, and where most top-ranking guides say nothing.
Rule 1: position in the list matters only above 1%. Under US labeling rules, ingredients above 1% must be listed in descending order. Ingredients at 1% or less may be listed in any order (21 CFR 701.3). A peptide sitting near the end of a list could be at 1% or at a few parts per million, and the order alone will not tell you which.
Rule 2: "10% Argireline" is not 10% peptide. Most peptides are sold as dilute solutions. Argireline peptide solution lists water first, then Acetyl Hexapeptide-8 (Lubrizol). Matrixyl 3000 lists glycerin, water, butylene glycol, carbomer and polysorbate 20 before its two peptides (Sederma). So a front label that says "10% Argireline" or "5% Matrixyl" is telling you the percentage of the supplier solution.
Rule 3: real peptide levels are often tiny. The 2023 review cites an industry use survey in which many peptides were used at 1 to 30 parts per million, with under 10 ppm described as customary. It reports Acetyl Hexapeptide-8 at up to 0.005% in eye lotions and face and neck products (Ngoc et al.). Small numbers are normal for peptides. What matters is that the brand tells you.
Rule 4: look for a stated percentage and a position that fits it. Our GHK-Cu Copper Peptide Serum states 1% GHK-Cu, and copper peptide is the second ingredient on its INCI list. That is the kind of transparency to ask for. If a brand hides peptides in a "proprietary complex," you cannot compare it to anything.
What do peptides pair with?
Peptides are flexible partners, with a few exceptions.
- Other peptides: stacking different types is common, as covered above.
- Hyaluronic acid: the 2025 review describes copper peptide combined with hyaluronic acid in research formulas (Pintea et al.). Compare the two in peptides vs hyaluronic acid.
- Niacinamide and retinoids: a 196-woman, 8-week study looked at a regimen that combined niacinamide, peptides and a retinol ester (Fu et al., 2010). See niacinamide vs peptides and peptides vs retinol.
- Keep copper peptides apart from: chelators like EDTA and fruit acids in the same formula (Lotioncrafter). In our routines, we also never layer copper peptides with vitamin C in the same application.
Wondering how peptides stack up against collagen creams? Read peptides vs collagen.
How do peptides for anti ageing fit into a routine?
Peptides fit easily into most routines. The ones covered here are water-phase ingredients, so they suit a light serum that goes on right after cleansing.
- Cleanse and pat skin almost dry.
- Apply your peptide serum. For our GHK-Cu Copper Peptide Serum, use 2 to 3 drops on face and neck, twice daily. One 0.5 oz bottle holds about 300 drops.
- Follow with moisturizer to hold in hydration, and sunscreen in the morning.
- If you use retinol every other night, use your copper peptide serum on the alternate nights.
- Give it time. The studies above ran 30 days to 12 weeks, so judge your results over at least that long.
If you like to make your own, our DIY peptide formulation guide covers use rates, pH and mixing order step by step. You can browse every peptide we carry in our age-defying peptide collection.
Frequently asked questions
What are skin peptides?
Skin peptides are short chains of amino acids used in skincare to send specific messages to skin. Research reviews group them into four types: signal, carrier, neurotransmitter-modulating and enzyme-inhibitor peptides. Each has its own INCI name on the label, such as Copper Tripeptide-1 or Palmitoyl Tripeptide-1, which tells you exactly which peptide is inside.
Are skincare peptides the same as collagen?
No. Native collagen is a large protein of about 300 kDa, and the outer skin layer is the main barrier to it, so in skincare it mainly holds water at the surface. Skincare peptides are much smaller amino acid sequences chosen for a specific role, such as signaling or delivering copper.
How long do peptides take to show results?
The studies cited in this guide ran from 30 days to 12 weeks. Sederma's Matrixyl 3000 study measured results at 2 months, and a copper peptide cream study ran 12 weeks. Use a peptide serum consistently, twice a day, for at least 8 to 12 weeks before you judge how your skin looks.
Can I use more than one peptide at a time?
Yes. Combining peptide types is common in formulas. A 43-woman study reported a larger reduction in the look of wrinkles when two expression line peptides were used together than with either one alone. Just keep copper peptides away from chelators, fruit acids and vitamin C in the same application.
Why is the peptide percentage on my label so low?
Peptides are typically used at small amounts. A 2023 review cites an industry survey where many peptides were used at 1 to 30 parts per million. Also, a front-label number such as "10% Argireline" usually refers to the supplier's dilute solution, not pure peptide. Ask the brand which one it means.
Sources
- Pintea A, et al. Peptides: Emerging Candidates for the Prevention and Treatment of Skin Senescence: A Review. Biomolecules, 2025;15(1):88. pmc.ncbi.nlm.nih.gov/articles/PMC11762834
- Ngoc LTN, Moon JY, Lee YC. Insights into Bioactive Peptides in Cosmetics. Cosmetics, 2023;10(4):111. mdpi.com/2079-9284/10/4/111
- Schagen SK. Topical Peptide Treatments with Effective Anti-Aging Results. Cosmetics, 2017;4(2):16. mdpi.com/2079-9284/4/2/16
- Sederma. Matrixyl 3000 product data sheet (via distributor Pochteca). sip.pochteca.net
- Lotioncrafter. Matrixyl 3000 raw material listing. lotioncrafter.com/products/matrixyl-3000
- Lubrizol. Argireline peptide solution NP. lubrizol.com
- Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. Int J Mol Sci, 2018;19(7):1987. mdpi.com/1422-0067/19/7/1987
- Lotioncrafter. LCPeptide Copper raw material listing. lotioncrafter.com
- Lubrizol. Relistase peptide solution (SpecialChem technical listing). specialchem.com
- Lubrizol. Leuphasyl peptide (SpecialChem technical listing). specialchem.com
- US Code of Federal Regulations, 21 CFR 701.3, Designation of ingredients. ecfr.gov
- Andrei F, et al. Unlocking the potential of collagen: A comprehensive review on its dermocosmetic benefits and applications. Braz J Pharm Sci, 2025;61:e23983. scielo.br
- Fu JJJ, et al. A randomized, controlled comparative study of the wrinkle reduction benefits of a cosmetic niacinamide/peptide/retinyl propionate product regimen. Br J Dermatol, 2010;162(3):647-654. scholars.mssm.edu