CeraVe Skin Renewing Retinol Serum | 30ml Facial Serum with encapsulated retinol and 3 essential ceramides that improves the appearance of fine lines and wrinkles in 4 weeks and provides 24-hour hydration. Developed in collaboration with dermatologists, it helps restore the protective epidermal barrier and ceramides that decrease with age, while it has been clinically proven to provide smoother, softer skin with virtually zero irritation. Clinically proven to deliver a 38% improvement in rough texture for smoother skin in just 2 weeks, with zero irritation. This lightweight, non-greasy serum absorbs instantly into the skin, leaving it feeling softer and smoother, as well as visibly improving health, radiance, firmness and the appearance of pores. It is recommended to use the product once every night.