collagen
Copper Peptides and Collagen: GHK-Cu, Skin Structure and Elasticity
Here's the link between copper peptides and collagen in two sentences. In lab studies, the copper peptide GHK-Cu gets skin cells to make more collagen and helps clear out the damaged kind, and copper itself is needed to knit new collagen fibres together. On people, creams and serums with GHK-Cu have left skin measuring denser and thicker in small studies, which is what you'd expect if collagen were involved.
This article follows collagen from start to finish: what it is, how skin makes it, why that slows down, and where GHK-Cu steps in. We also cover elastin, collagen's partner in skin's bounce after 30. Then what the evidence found on real skin, and what it didn't. If you're new to the peptide, start with what GHK-Cu is. For the broader question of why skin ages in the first place, see the science behind skin ageing.
Collagen: the scaffolding under your skin
Most of what makes skin feel firm sits in the dermis, the thick layer under the surface. It's built mostly from collagen, a tough, rope-like protein. A 2019 review in the International Journal of Molecular Sciences puts collagen at about 75% of the dry weight of skin.
There are several types. Type I makes up 80 to 90% of skin collagen and does the heavy structural work. Type III, around 8 to 12%, forms a finer mesh. Woven through them are elastin, which lets skin spring back, and water-holding molecules that keep the whole thing plump. We come back to the spring-back side below.
Collagen isn't made once and kept forever. It's constantly being built, damaged, cleared and rebuilt. Healthy skin keeps those two sides roughly in balance. Ageing skin loses the balance.
How skin makes collagen, and why it slows down
The cells that do the work
Collagen is made by fibroblasts, cells scattered through the dermis. They build long collagen chains, send them out, and those chains are then cross-linked into strong fibres. That cross-linking step needs an enzyme called lysyl oxidase, and lysyl oxidase needs copper to work. Hold that thought.
What goes wrong with age
The 2019 review describes two things happening at once. Collagen becomes fragmented and coarse, and the total amount falls. Then the damage feeds itself. Fibroblasts hold on to the collagen around them to stay stretched and active. As that collagen breaks up, they lose their grip, shrink and collapse, and make less new collagen.
Where the sun comes in
UV light speeds all of this up. The same review explains that UV triggers enzymes called metalloproteinases, MMPs for short, which cut collagen apart. That's why sun-exposed skin tends to show deeper lines and more laxity than skin that's been covered. It's also why daily sunscreen protects collagen better than any product you put on afterwards.
Skin elasticity: why collagen doesn't work alone
Elasticity is skin's ability to stretch and snap back. Pinch the back of your hand and let go: how fast it flattens out is elasticity at work. Collagen is only one of three things in the dermis behind it.
- Collagen gives strength. It's the rope that stops skin stretching too far.
- Elastin gives recoil. It's the spring that pulls skin back into place.
- Water-holding molecules such as hyaluronic acid fill the space between them and keep the dermis cushioned. Chemists call these glycosaminoglycans.
When researchers measure elasticity, they usually use a small suction probe. It pulls the skin up gently, lets go, and records how far it stretched and how fully it returned. Worth knowing, because "firmer-looking" on a label and "more elastic" on a probe are not the same measurement.
How elasticity changes after 30
Elasticity doesn't fall off a cliff. It drifts. In a 2008 study in Skin Research and Technology, Ryu and colleagues measured 96 women aged 20 to 75 on the face, upper arm and back. Elasticity fell steadily with age, and the face changed more than the arm or back.
The face gets the most sun, and UV breaks down elastin as well as collagen. By your 30s most people notice it in small ways: a pillow crease that lasts past breakfast, skin under the eyes that takes longer to smooth out. It's the appearance of firmness going first, well before anything you'd call sagging.
What copper peptides do to collagen
GHK-Cu turns up at each stage of that cycle. Everything in this section comes from cell and animal research, not from skin on a face.
They get fibroblasts making more
A 2015 review in BioMed Research International reports that GHK-Cu increases collagen production by fibroblasts, and also raises decorin, a protein that helps collagen fibres line up neatly. The same review describes GHK helping fibroblasts recover their ability to divide after radiation damage in the lab.
A 2016 study by Badenhorst and colleagues tested this directly on adult human fibroblasts. At every concentration they tried, GHK-Cu increased both collagen and elastin production.
They support elastin and the cushioning around it
This is where copper peptides and skin elasticity meet. Besides the elastin result above, the 2015 review reports that GHK-Cu raised water-holding molecules such as dermatan sulfate and chondroitin sulfate in the lab. So in a dish, it nudges all three parts of skin's bounce: rope, spring and cushion.
They help clear the damaged collagen
This is the part people miss. Badenhorst's team found GHK-Cu switched up the genes for two MMPs, the enzymes that break collagen down, at the lowest dose. At every dose, it also switched up the gene for TIMP-1, a protein that keeps those enzymes in check. The authors tied the gain in collagen to that balance.
That sounds contradictory until you think of it as renovation. Old, fragmented collagen has to go before new fibres can take its place. Chemists call this matrix remodelling. GHK-Cu seems to support both halves of it, rather than simply pushing production.
They deliver copper for cross-linking
Remember lysyl oxidase. A 2018 review by Pickart and Margolina lists connective tissue formation among the jobs that depend on copper enzymes. GHK carries copper in a form the body can use. That's one reason the peptide and the copper are paired: new collagen that isn't properly cross-linked is weaker.
Copper peptides and collagen: what the human studies found
We haven't found a published study that measured collagen directly in facial skin after people used a copper peptide product. What we have are studies that measured things collagen affects. Our full scientific review of GHK-Cu covers every one in detail.
- Skin density and thickness. The 2018 review reports a 12-week study of 71 women with sun-aged skin in which a GHK-Cu facial cream left skin measuring denser and thicker, and less lax. A thicker, denser dermis is consistent with more collagen, though it isn't a direct count.
- New collagen in a biopsy. A small study on thigh skin, also in the 2018 review, found more new collagen in 70% of people using a copper peptide cream, compared with 50% for vitamin C and 40% for a retinoid. It was small and measured how many people responded, not how much.
- Wrinkle depth. In Badenhorst's 8-week study of 40 women aged 40 to 65, a GHK-Cu serum reduced wrinkle volume by 55.8% and depth by 32.8% compared with a plain serum.
How to read that. What the studies did: tested specific formulas, mostly on women with sun-aged skin, for 8 to 12 weeks. How they relate to our products: adjacent. Different formulas and concentrations. What they don't prove: that any product, ours included, will increase your collagen. They're consistent with it, and that's as far as the evidence goes.
The 2015 review also lists better elasticity and firmness among results from cosmetic products with GHK-Cu, but we couldn't see the raw elasticity numbers, so treat the direction as encouraging and the size as unknown.
Why not just use collagen?
It's a fair question, and the answer is size. Collagen is an enormous molecule. Put it in a cream and it sits on the surface, where it works as a decent moisturiser but can't reach the fibroblasts. GHK-Cu is tiny by comparison, three amino acids long, and its job is to signal the skin to make its own.
Collagen supplements are a different question, since they're swallowed and broken down first. We've compared the two approaches in collagen supplements vs GHK-Cu.
How to look after your collagen
If collagen is what you care about, the order of priority is clear.
- Sunscreen, every day. UV is the biggest driver of collagen breakdown you can control. Broad-spectrum, SPF 30 or higher, and take it down to your neck.
- A collagen-supporting active at night. A retinoid if your skin tolerates one, a copper peptide if it doesn't, or both on different nights. We put 2% GHK-Cu in the serum.
- A moisturiser that keeps the surface comfortable. Dry, irritated skin doesn't do anything well.
- Patience. Collagen turns over slowly. The studies ran 8 to 12 weeks. Judge it over a bottle, with a photo from day one.
Our guide to using GHK-Cu morning and night covers amounts, order and what not to layer it with.
Frequently asked questions
Do copper peptides increase collagen?
In lab studies, yes: GHK-Cu increases collagen production by skin cells and helps clear damaged collagen. On people, small studies found skin measured denser and thicker after 12 weeks, which fits with more collagen. We haven't found a study that directly measured facial collagen after using a copper peptide product, so treat it as likely, not proven.
Do copper peptides improve skin elasticity?
In the lab, GHK-Cu increases elastin and collagen and raises the molecules that keep the dermis cushioned. In small human studies, creams with it left skin less lax and denser. That's encouraging, but the studies are small and short, and we couldn't verify the size of any elasticity change. Expect a modest, gradual effect at best.
How long do copper peptides take to affect collagen?
Collagen is slow to build and slow to show. The human studies measured changes at 8 to 12 weeks, so give any product at least that long before deciding. Surface changes such as feel and texture may come sooner. Deeper changes, if they come, take longer.
Are copper peptides better for collagen than retinol?
Retinoids have far more human evidence for collagen, so on evidence alone, no. Copper peptides work on collagen through a different route and are much gentler, which makes them a good option if retinoids irritate you, or a partner to them on alternate nights.
The short version
Collagen is the scaffolding under your skin, and it thins with age and sun. Elastin, its spring, goes the same way. In the lab, GHK-Cu gets skin cells making more collagen, helps clear the damaged kind, supports elastin, and supplies the copper that knits new fibres together. On people, the evidence is small but consistent with that. Protect what you have with sunscreen, support it with a collagen-friendly active, and judge the results over months, not days.
