What are PHAs and are they gentler than AHAs?

PHAs (polyhydroxy acids) like gluconolactone and lactobionic acid are a newer generation of chemical exfoliants with larger molecules that cannot penetrate deeply into skin. This makes them significantly gentler than AHAs, with comparable exfoliating benefits and the added bonus of humectant and antioxidant properties. PHAs are ideal for rosacea-prone, sensitive, or eczema-prone skin that cannot tolerate traditional AHAs or BHAs.