La Roche-Posay Pure Vitamin C10 Serum is a dermatological skincare solution containing 10% pure vitamin C, designed to address lack of radiance and signs of aging. This renovating and smoothing serum helps improve skin texture while providing antioxidant benefits. This serum combines pure vitamin C (ascorbic acid) with salicylic acid and neurosensine in a fast-absorbing formula suitable for sensitive skin. For best results, apply 3-4 drops in the morning on cleansed face and neck, avoiding the eye area. Use in conjunction with SPF protection. While the serum may naturally turn yellow when exposed to air due to vitamin C oxidation, this does not affect its efficacy.