La Roche-Posay Pure Vitamin C Serum is a potent skincare solution containing 10% pure vitamin C, salicylic acid, and neurosensine. This lightweight, fast-absorbing serum helps combat signs of aging, brighten skin tone, and provide antioxidant protection while being suitable for sensitive skin. The serum should be applied in the morning on cleansed face and neck, avoiding the eye area. For best results, use 3-4 drops and follow with SPF protection. The formula may naturally turn yellow when exposed to air due to vitamin C oxidation, but this does not affect its efficacy. The serum has a light, non-greasy texture that makes it an excellent makeup base. Regular use helps reduce fine lines and wrinkles while improving skin texture and radiance.