I bought this but then decided I wanted a different strength so my loss is your gain. Professional C® Serum 10% is formulated with 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 Questions? Leave a comment below!