Perricone's new brightening antioxidant serum — the Perricone MD CCC + Ferulic Brightening Complex 20% (£129) — boasts an impressive 20% vitamin C concentrate that's made up of three different types of the powerhouse ingredient: vitamin C ester, ether, and phosphate. The complex is combined with ferulic acid and phospholipids to stabilise the formula, whilst vitamin E adds a nourishing element.