Peptides in Skincare

What each cosmetic peptide does, what the evidence shows, and which ones are worth the money.

• Copper Peptides vs Retinol: Which One, and Can You Use Both?

  Two well-researched actives that work in opposite ways. What each is good at, why layering them causes trouble, and how to run both without wrecking your barrier.

• Matrixyl 3000 vs Argireline: Which Peptide Does What

  Sold interchangeably, but they solve different problems. One targets expression lines, the other targets structure. How to tell which one you actually need.