Our most potent Retinol serum ever. NEW Advanced Retinol Nightly Multi-Correct Serum provides efficient conversion of Retinol into the skin’s surface, plus NIA-114TM, our patented form of Niacin is clinically shown to enhance the efficacy of Retinol. This unique formulation helps limit irritation and common sensitivity so there’s no dryness or irritation – just real, visible results.