You’ve likely heard plenty about the radiance-boosting benefits of vitamin C but did you know that azelaic acid is another ingredient that can be effective at brightening the skin? Here, facetheory Education Manager Claire Balas tells us all we need to know about the ingredient and their best-selling azelaic acid serum as found in The Brightening Box.

The products included in The Brightening Box are hand-picked by our Founder and Skincare Expert, Caroline Hirons. Read on to find out why she chose the products and to discover her top tips for dealing with dull skin.