Quick answer: Copper peptides are tiny chains of amino acids bound to a copper ion. The best known, GHK-Cu (listed on labels as copper tripeptide-1), is used in skincare to help skin look firmer, smoother and more even, and to support a healthy-looking skin barrier. Apply a copper peptide serum to clean, hydrated skin, morning and/or night, before moisturizer, and avoid layering it at the same time as vitamin C (ascorbic acid) or strong exfoliating acids.
Six peptides, one serum
N° 04 Copper Concentrate
Copper tripeptide-1 plus five more peptides, hyaluronic acid, manuka honey and centella. 30 mL.
What are copper peptides?
Peptides are short chains of amino acids, the building blocks of proteins such as collagen and elastin. GHK is a three-amino-acid peptide (glycine, histidine, lysine) that occurs naturally in human plasma, saliva and urine. It has a strong affinity for copper and readily forms the complex GHK-Cu.
GHK was first identified by biochemist Dr. Loren Pickart in 1973. In a 2018 review in the International Journal of Molecular Sciences, Pickart and Margolina note that plasma GHK levels fall significantly with age, from roughly 200 ng/mL at age 20 to about 80 ng/mL by age 60, which is part of why it attracted interest as a skincare ingredient.
What do copper peptides do for skin?
Laboratory and clinical research on GHK-Cu, summarized in the review cited below, has looked at its role in skin remodeling, including signaling related to collagen, elastin and glycosaminoglycans. In cosmetic terms, a well-formulated copper peptide serum is used to:
- Help skin look firmer and more elastic
- Smooth the look of fine lines and rough texture
- Support a comfortable, healthy-looking skin barrier
- Improve the look of radiance and tone
Results from topical cosmetics are gradual. Give any new serum at least 8–12 weeks of consistent use before judging it.
Copper peptides vs. other peptides
| Peptide (INCI name) | Type | Why it's used |
|---|---|---|
| Copper Tripeptide-1 (GHK-Cu) | Carrier / signal peptide | Firmness, smoothness, barrier support |
| Palmitoyl Tripeptide-1 & Palmitoyl Tetrapeptide-7 | Signal peptides (often sold together as Matrixyl 3000) | Smoother-looking skin, look of fine lines |
| Palmitoyl Tripeptide-5 | Signal peptide | Look of firmness |
| Palmitoyl Tripeptide-38 | Signal peptide | Look of wrinkles and texture |
| Acetyl Hexapeptide-8 (Argireline) | Neurotransmitter-inhibiting peptide | Look of expression lines |
Peptides work well in combination. N° 04 Copper Concentrate contains all six peptides above alongside hyaluronic acid, manuka honey, centella and ginseng extracts.
How to use a copper peptide serum
- Cleanse with a gentle, non-stripping cleanser such as N° 01 Cleansing Milk.
- Hydrate with a mist or toner, then an essence, so skin is supple. N° 02 Saffron Mist and N° 03 Renewal Essence are designed for this.
- Apply 3–4 drops of serum. Warm them between your fingertips and press into face and neck.
- Seal with moisturizer such as N° 05 Rich Cream.
- In the morning, finish with sunscreen.
Copper peptides can be used once or twice a day. See the full skincare routine order for where each step fits.
What not to mix with copper peptides
- Vitamin C (L-ascorbic acid): Copper can accelerate the oxidation of ascorbic acid, and the low pH that vitamin C serums need can destabilize peptides. Use vitamin C in the morning and copper peptides at night, or alternate days.
- Strong AHAs and BHAs: Low-pH exfoliating acids (glycolic, lactic, salicylic) may break down peptides and increase the chance of irritation. Use them on different nights.
- Retinoids: Many people use both. If your skin is sensitive, start by using them on alternate nights and watch how your skin responds.
Good partners: hyaluronic acid, snail mucin, panthenol, ceramides, squalane and other peptides all pair well. That's why The Renewal Ritual layers a snail mucin essence directly under the copper peptide serum.
The perfect pairing
The Renewal Ritual
Cleansing Milk, snail mucin Renewal Essence and Copper Concentrate: cleanse, hydrate, then treat.
Are copper peptides safe? Side effects to know
Copper peptides are generally well tolerated at the concentrations used in cosmetics. As with any new product, patch test first. Stop using it if you notice persistent redness, stinging or itching. Products with botanical extracts or honey (like N° 04 Copper Concentrate) need extra care if you're sensitive to plant extracts or bee products.
Start your 8-week ritual
Smoother, firmer-looking skin starts with consistency.
Get N° 04 Copper Concentrate on its own, or save with The Renewal Ritual. Take another 10% off with code BARE.
- Cruelty-free
- Made in the USA
- Ships in 1–3 business days
- 14-day returns
Frequently asked questions
What are copper peptides good for?
Copper peptides are used to help skin look firmer, smoother and more radiant, and to support a healthy-looking skin barrier.
Is copper tripeptide-1 the same as GHK-Cu?
Yes. Copper tripeptide-1 is the INCI (ingredient label) name for GHK-Cu.
Can I use copper peptides every day?
Yes. Most copper peptide serums are designed for daily use, morning and/or evening.
Can I use copper peptides with vitamin C?
It's best not to apply them at the same time. Use vitamin C in the morning and copper peptides at night, or alternate days.
Can I use copper peptides with retinol?
Many people do. If you have sensitive skin, use them on alternate nights at first.
Can I use copper peptides with snail mucin or hyaluronic acid?
Yes. Hydrating ingredients like snail mucin and hyaluronic acid pair well with copper peptides.
How long do copper peptides take to work?
Give a copper peptide serum 8–12 weeks of consistent use to see changes in how skin looks and feels.
Sources
- 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. PMC6073405
Keep reading
- Snail Mucin: What It Is and What It Does for Skin
- Skincare Routine Order: How to Layer Your Products
- Essence vs. Serum vs. Toner
This article is for general education and isn't medical advice. If you have a skin condition, talk to a board-certified dermatologist.