What Is TCA and Why Concentration Matters Trichloroacetic acid (TCA) is a chemical exfoliant used to improve skin tone, texture, pigmentation, and fine lines. The percentage matters because it determines how deeply the peel penetrates the skin. A 15% TCA peel is often preferred for those looking for results with less downtime and lower risk compared to stronger concentrations. My Product … Continue reading How to Dilute 30% TCA to 15% + Benefits of a 15% TCA Peel