Quick answer
Peptides are the gentle end of anti-ageing — slower than retinol, but usable by skin that retinol defeats.
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1. A short chain of amino acids
A short chain of amino acids — the building blocks of proteins like collagen. Applied topically, certain peptides signal skin to behave as though it needs to repair, which supports firmness and barrier function.
Honest expectations
2. Supportive, not transformative
Peptides are supportive, not transformative. The evidence is real but modest compared with retinoids. Results take months, and they are subtle.
Who they suit
3. Skin that cannot tolerate retinol
- Skin that cannot tolerate retinol
- Anyone pregnant or breastfeeding (generally considered safe — confirm with your doctor)
- Barrier repair alongside ceramides
- People who want an easy addition with almost no irritation risk
How to use
4. Any time of day, under moisturizer
Any time of day, layered under moisturizer. They combine comfortably with niacinamide, hyaluronic acid and ceramides. Avoid using in the same routine step as strong acids, which can break them down.
What they will not do
5. They do not replace sunscreen or retinol
Replace sunscreen, fade dark spots meaningfully, or match retinol for fine lines.
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Frequently asked questions
Is a peptide serum a safe option for skin that reacts to retinol?
Yes, a peptide serum can be a gentler option for skin that reacts to retinol, though results are slower and more subtle. If you're pregnant or breastfeeding, confirm with your doctor before adding any new active.
How can I check if a peptide serum is genuine?
Match the batch code on the bottle to the one on the box, and check whether the seal or pump looks like it has already been used. A sudden change in texture or smell is a reason to contact the seller before applying it.
Should I apply a peptide serum in the morning or at night in hot weather?
Peptide serums can be used morning or night, but if you apply one in the morning, always follow it with sunscreen. Applying at night may absorb slightly better since there is less sweat to interfere with it.