Peptides vs. Acids: What Belongs in Your Routine?

Peptides and acids can both be useful, but they do different cosmetic work. Here is the calm way to choose.

By Elena Vale Cosmetic chemist, MSc Last updated June 4, 2026

Peptides usually support the look of smoothness, firmness, or density. Acids are used for the appearance of exfoliation, tone, or clarity. Many routines use both, but not always in the same step.

Active type	Best for	Routine note
Peptides	Smooth, firm, repair, grow	Layer before moisturizer.
Azelaic acid	Brighten, clarify, calm	Use SPF in daytime routines.