What it is: An advanced brightening serum inspired by dermatological treatments to help improve skin's youthful clarity.What it does: It targets visible dark spots and dullness for a luminous, revitalized complexion. This serum contains the highest concentration of the brand's brightening ingredient 4MSK to target visible hyperpigmentation and brighten skin's tone. A sea ferment brightener actively prevents hyperpigmentation before it appears. Over time, skin appears more even-toned, infused with supreme radiance while remaining nourished and moisturized for up to 24 hours. How to use: Apply to your face morning and evening after your toning lotion. Press the pump twice into your palm then gently smooth over skin. 1.3 oz.