HOW TO STORE - Storing this serum in your fridge or a cool, dark place will extend the life of it by slowing down the oxidation process that naturally occurs in Vitamin C. HOW TO APPLY - Great for both AM and PM use! On clean skin, apply evenly on the face, neck, and/or upper chest. SPF recommended after morning use. Can be added to any skincare routine. 24/7 PROTECTION - Offering all-day protection against environmental pollutants, the lightweight, non-greasy formula absorbs quickly and transparently in the skin. Recommended for all skin types. TURN BACK THE CLOCK - Vitamin C restores & neutralizes environmental stressors that can accelerate the signs of aging. Plus, this serum includes a 10% concentration of L-ascorbic acid, a highly effective skin antioxidant and collagen builder. BRIGHTEN & CORRECT - Our Vitamin C serum not only brightens skin, builds collagen & evens out tone, it’s enhanced with Vitamin E & Ferulic Acid to correct hyperpigmentation + discoloration & promote healthy skin turnover. 10% VS. 20% - For those with sensitive skin, Timeless Skin Care 10% Vitamin C + E Ferulic Acid Serum is a potent, yet less-stimulating alternative to our 20% Vitamin C serum. Ideal for first time Vitamin C users!.