YSL Pure Shots Light Up Serum Brand New Deluxe Sample .23 oz Illuminating serum that instantly brightens and improves skin tone while reducing dark spots and discoloration for a luminous, even complexion. A daily dose of brightening care: a lightweight, fast-absorbing serum infused with Vitamin Cg and marshmallow flower to help neutralize pollution, environmental stressors, and the damaging effects of free radicals. The hydrating antioxidants reduce the look of hyperpigmentation and redness.