**What It Is**: A jumbo-sized version of Sunday Riley's brightening serum. **What It Does**: With a 15% infusion of THD ascorbate - a potent, ultra-stable form of vitamin C - this fast-absorbing formula fights the appearance of dullness and discoloration while helping boost radiance and brightness for a glowing complexion. **How to use**: Apply one to two pumps of serum to cleansed skin; we recommend using both day and night. **Key Ingredients** * Vitamin C: A sought-after ingredient in most modern skincare, vitamin C stimulates the production of collagen and helps to reduce the appearance of fine lines and wrinkles over time. When used on a regular basis, it helps to fade acne scars and reduce discoloration, improving the texture and tone of the skin. **What It Is**: A jumbo-sized version of Sunday Riley's brightening serum. **What It Does**: With a 15% infusion of THD ascorbate - a potent, ultra-stable form of vitamin C - this fast-absorbing formula fights the appearance of dullness and discoloration while helping boost radiance and brightness for a glowing complexion. **How to use**: Apply one to two pumps of serum to cleansed skin; we recommend using both day and night. **Key Ingredients** * Vitamin C: A sought-after ingredient in most modern skincare, vitamin C stimulates the production of collagen and helps to reduce the appearance of fine lines and wrinkles over time. When used on a regular basis, it helps to fade acne scars and reduce discoloration, improving the texture and tone of the skin. Sunday Riley uses advanced, clinically proven ingredients blended with balancing botanicals for non-irritating, fast-acting formulas that work to transform the skin.