Glycolic Acid is the O.G. chemical exfoliant. It loosens the ‘glue’ that helps dead skin cells cling to the surface, revealing younger, fresher cells beneath. Result: softer, smoother, more radiant skin - plus, you’ll be clearing the way so that the serums and moisturisers you apply afterwards work harder, too. Use it when skin is looking dull or congested - or you just want an instant refresh.