Combination of retinol (pure vitamin A) and palmitic acid. Research has shown it to be effective as an antioxidant and skin-cell regulator. 
- Duell E, Kang S, Voorhees J. Unoccluded retinol penetrates human skin in vivo more effectively than unoccluded retinyl palmitate or retinoic acid. J Invest Dermatol. 1997;109(3):301-5.