Do copper peptides (GHK-Cu) work in skincare?
GHK-Cu shows positive effects on collagen in the lab, but clinical evidence in humans is lacking. Do not expect too much from it in an ordinary daily moisturiser, especially while the question of skin penetration remains unresolved.
GHK-Cu in a daily moisturiser is uncertain: the evidence comes almost exclusively from cell and laboratory studies, not from studies in real people. In cell cultures, GHK-Cu stimulates the production of several types of collagen. A combination with hyaluronic acid increased the production of collagen IV by as much as 25 times in cell cultures, and by a further 2 times in an ex-vivo skin model. That sounds impressive, but it is not proof that your skin will respond to it as well.
The biggest practical problem is penetration. GHK-Cu is water-soluble, and the outermost skin layer preferentially allows lipid-rich substances through. As a result, the active ingredient probably does not reach a sufficient depth in the skin. Researchers are testing variants in which GHK is coupled to an arginine tail to improve penetration, but that too is currently limited to cell and animal models. Liposomes as an encapsulating vehicle are also being investigated, but here too clinical evidence in humans is lacking.
The broad claims made for cosmetic products, such as firmer skin, fewer wrinkles and reduced photodamage, are largely traceable to laboratory research and reviews by the same researchers who have a commercial involvement with GHK. Bear that in mind when reading a label: 'stimulates collagen synthesis' or 'resets 4,000 genes' are claims observed in the lab, not proven in people using a jar of moisturiser. If you still want to try it, choose a product that states how GHK-Cu is encapsulated, such as in liposomes, because a simple aqueous solution probably does not reach enough depth to have an effect. What does not matter: the concentration on the label says little if the formula does not carry the peptide deep enough.
On the subject of safety, no side effects have been reported in the studies examined. Reviews mention a long history of use without problems, but formal confirmation in humans is lacking. There is no direct reason for concern, but that does not provide certainty either.
All claims are based on review articles, cell and ex-vivo laboratory studies, and animal models. No large randomised clinical trials in humans are available. Several reviews come from the same research group with commercial interests in GHK.
Do peptides in skincare actually do anything?
Peptides in creams have a plausible mechanism on paper, but clinical evidence for topical use is thin. If you want to do something about skin ageing, oral collagen currently has the stronger foundation, though that too should be interpreted with some caution.
What actually works against skin aging?
Using sunscreen daily is the best-supported way to slow skin ageing, supplemented by not smoking, moderate alcohol consumption and sufficient sleep. Cosmetic options such as thread lifts and honey in creams have a weaker or not yet sufficiently proven basis and call for a critical weighing of the risks.
Do collagen supplements work against skin ageing?
Oral hydrolysed collagen measurably improves elasticity, hydration and wrinkles, after as little as 8 weeks at 2.5 to 5 grams per day. Look for 'collagen peptides' on the label and do not buy it for hair, nails or muscles.
Do gua sha and microcurrent devices work against skin ageing?
Gua sha and facial rollers show initial positive results, but the evidence is thin; microcurrent devices have somewhat more support, though that too is limited. It is most sensible not to hold high expectations and not to take long-term effects for granted.
Does skin cycling actually work better for your skin?
Skin cycling as a protocol has not been scientifically tested, so no proven benefit can be attributed to it. Some of the ingredients it features, such as ceramide moisturisers and nicotinamide, do have solid evidence behind them individually.
Do chemical peels with fruit acids help against skin ageing?
Chemical peels demonstrably help against sun damage, wrinkles, and pigmentation spots, but for brown spots laser treatments perform better. For stubborn pigmentation such as melasma, a peel alone is simply not enough.