La Roche-Posay Vitamin C Face Serum is an anti-aging vitamin c face and neck serum that leaves skin more radiant, softer, and hydrated. As a result, wrinkles look visibly reduced and skin texture and tone are more even and refined. This serum combines concentrated 12% pure vitamin c, salicylic acid and neurosensine for optimal effectiveness while also being suitable for sensitive skin. How to use: Fill dropper with serum and apply 3-4 drops in the morning on face and neck. Avoid eye area. Apply after cleansing. Can be used alone or under a moisturizer. Use in association with SPF protection. Pure vitamin C can react on contact with the air, causing it to turn yellow. But it’s still effective.