"After cleansing, I always apply an antioxidant serum to help fight free radicals. I have acne-prone skin and prefer to use an oil-free formula that is less likely to cause breakouts. One of my favourites is SkinCeuticals Phloretin CF with Ferulic Acid ($166), which contains a potent blend of vitamin C, phloretin, and ferulic acid to combat sun damage and give my skin a more even texture and tone."