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Ingredient glossary
Peptides: What It Is and What It Does
Peptides are short chains of amino acids, the building blocks of proteins such as collagen. In skincare, peptides are included to signal skin cells to support natural collagen production or other structural processes, and are commonly found in anti-ageing serums and moisturisers aimed at firmness and texture.
What it does
Peptides work as messenger molecules: certain sequences are used because they can signal skin cells to behave as though collagen has been damaged and needs replacing, encouraging the skin's own repair processes. Other peptide types are used for different purposes, such as helping to relax the appearance of expression lines or supporting the skin barrier. Because peptides are large molecules, formulation matters for how well they can reach their target layer, and effects generally build gradually with sustained use rather than appearing quickly.
Who it suits
Peptides are generally used by people interested in supporting skin firmness, elasticity and the appearance of fine lines over time, and are often introduced as skin matures. They are typically gentle and considered suitable for sensitive skin, since they do not exfoliate or increase sun sensitivity the way acids and retinol do.
Cautions
Peptides are generally well tolerated with low irritation risk. As with any active, patch testing is sensible when trying a new product, particularly one combining peptides with other ingredients. Claims made for specific peptide types vary widely in strength of evidence, so it is worth treating dramatic marketing claims with some scepticism rather than taking them as guaranteed outcomes. Anyone with a persistent skin concern should consult a dermatologist rather than relying on cosmetic products alone.
Products with Peptides
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cruelty-free
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fragrance-free
- fragrance-free
Frequently asked questions
- Do peptides really boost collagen?
- Certain peptide sequences are formulated specifically to signal skin cells in ways associated with supporting natural collagen-related processes, which is the basis for their inclusion in anti-ageing products. The strength of evidence varies by specific peptide, so it is sensible to treat individual product claims with some caution.
- Can peptides be used with retinol?
- Yes, peptides are generally considered compatible with retinol and are often marketed together, since peptides do not typically cause the dryness or sun sensitivity associated with retinol and instead focus on a different, complementary mechanism.
- How long do peptides take to show results?
- As with most ingredients that work on skin structure rather than surface effects, meaningful results are generally associated with consistent use over several weeks to months, in line with skin's natural renewal and repair timelines, rather than an immediate visible change.
This is general information about a cosmetic ingredient, not medical advice. It does not describe any specific product, and does not diagnose, treat or cure any condition. If you have a persistent skin or scalp concern, speak to a pharmacist, GP or dermatologist. See our editorial policy for how we handle claims.