Chemistry class is incomplete without an alpha hydroxy acid by your side. This exfoliating active has recently found its way into many of our skincare products and is a user favourite for a reason. It brightens the skin, sloughs off any dead skin cells, and promotes collagen production, too. What’s not to love? Pro tip: Stick to a concentration of less than 10% of AHAs in your products to avoid any negative side-effects. Use products with a higher concentration of AHAs less frequently to avoid over-exfoliation.