Sunday Riley C.E.O. 15% Vitamin C Brightening Serum

This potent, fast-absorbing formula fights the appearance of dullness and discoloration, increasing radiance and brightness with a 15% infusion of THD ascorbate - a potent, ultra-stable form of vitamin C. **How to use:** Apply one to two pumps of serum to cleansed skin; we recommend using both day and night.