This is a polyhydroxy acid (PHA), a type of exfoliating acid that works by gently lifting off dead skin cells to make the skin smooth and even. PHAs are similar to AHAs, but are considered to be “next generation” because it doesn’t have the irritation that AHAs usually cause. They are also excellent at skin moisturization, and gluconolactone specifically has antioxidant properties. This is definitely a must-try for people with sensitive skin who want a gentle exfoliant!