In the ABC’s - err, ABP’s of acids, PHAs are a standout category thanks to their relatively gentler and mildly exfoliating properties. One such polyhydroxy acid is gluconolactone, which is recommended even for daily use for all skin types – yes, including sensitive skin, too. Combined with vitamin C, retinoids, and other AHAs and BHAs, it has an anti-ageing effect on the skin as it sloughs away dead skin cells and simultaneously hydrates it. We recommend trying this ingredient out if you have extra-sensitive skin that doesn’t usually play nice with other aggressive exfoliants. Pro tip: As is the case with all exfoliating acids, we suggest wearing sunscreen after using a gluconolactone-powered product to avoid skin damage caused by sun sensitivity.