Professional C® Serum 10% is formulated with 10% L-Ascorbic Acid to help brighten and even skin tone, strengthen skin's antioxidant defenses and improve the appearance of fine lines and wrinkles without irritating skin. For a supercharged glow and more youthful-looking skin. Ideal for dry to sensitive skin types. Formulated with L-Ascorbic Acid to brighten skin Helps to neutralize free radicals For a more even-looking complexion. How to use: Step 1: Apply 5-7 drops in the morning after cleansing and toning, before moisturizer. Step 2: Follow-up with SPF before makeup application. Ingredients: L-ascorbic Acid 10% - Known as the purest form of Vitamin C, L-ascorbic Acid helps neutralize free radicals, minimize the look of fine lines and wrinkles, and brighten skin tone. Full Ingredients: Propylene glycol, aqua/water/eau, propylene carbonate, L-ascorbic acid, fragrance (parfum).