Peptides are short chains of amino acids, the building blocks of proteins such as collagen. In skincare, peptide serums are used to help skin look firmer, smoother and more resilient, and they are gentle enough for most skin types.
What are peptides in skincare?
A peptide is a small string of amino acids. Different peptides play different cosmetic roles: signal peptides, carrier peptides (such as copper peptide GHK-Cu) and neurotransmitter-inspired peptides used for the look of expression lines.
What is copper peptide (GHK-Cu)?
GHK-Cu is a naturally occurring tripeptide bound to copper. It is one of the most searched skincare ingredients in the US, prized for a smoother, firmer-looking complexion. You will find it in the Cosmecell PDRN & Copper Peptide Toner Serum.
How to use a peptide serum
- Apply after cleansing and toner, on slightly damp skin.
- Use morning and/or night.
- Seal with moisturizer; finish with SPF by day.
What to pair with peptides
- Hydrators (hyaluronic acid, snail mucin): great partners.
- PDRN: a popular K-beauty pairing, see our PDRN guide.
- Strong acids or vitamin C: use at a different time of day to copper peptides.
Who should use peptide serums?
Anyone wanting smoother, firmer-looking skin, including sensitive skin that cannot tolerate strong actives. Browse peptide skincare and anti-aging skincare.
FAQ
Are peptides good for sensitive skin?
Yes, peptides are generally well tolerated. Patch test as with any new product.
Can I use copper peptides with vitamin C?
Use them at different times of day, for example vitamin C in the morning and copper peptides at night.
Peptides or retinol?
They do different jobs and can both feature in a routine; peptides are the gentler option.
This article is for general information about cosmetic products and is not medical advice.