Reviews
Independently tested peptide serum roundups and head-to-head comparisons, scored on formula, concentration and value.
31 articles
Argireline vs retinol
Argireline targets the look of expression lines; retinol targets overall skin texture. A cosmetic chemist explains the difference and how to combine them.
The best copper peptide serums, tested
We tested the leading copper peptide serums and ranked them on formula, concentration, texture and value, including budget, high-strength and Korean picks.
The best GHK-Cu serums, tested
Our tested picks for the best GHK-Cu serums, scored on formula, concentration and usability, including high-strength, K-beauty and sensitive-skin copper tripeptide-1 serums.
The best peptide serums, every budget
From drugstore to premium, these are the peptide serums our cosmetic-chemist editor rates most highly, tested on formula, texture and value.
Copper Peptides vs Retinol for Aging Skin: A Fair, Evidence-Aligned Comparison
Copper peptides vs retinol for aging skin: how each works, what cosmetic research shows, tolerability, and who each ingredient suits best.
How to Layer Peptides With Vitamin C and Retinol (Without Cancelling Anything Out)
Learn how to layer peptides with vitamin C and retinol: AM/PM routine order, why copper peptides and vitamin C are separated, and tolerance tips.
Matrixyl vs retinol
Matrixyl and retinol both target the look of fine lines but work differently. A cosmetic chemist compares tolerance, evidence and how to combine them.