Alastin’s Renewal Retinol delivers the maximum benefits of retinol, an ingredient universally recognized for its ability to fight against aging. Active retinol is encapsulated in a solid lipid, resulting in an anti-inflammatory and anti-irritant formula which can be used every evening. With this strength of Renewal Retinol (.5) individuals who are new to retinol or have sensitive skin should start with using this product 2 to 3 times a week, and build up their tolerance.