HydroPeptide Retinol 1% Routine Booster is formulated with exclusive patented Cell-Renew-16 and 1% Tri-Retinol Complex. This technology allows for a higher retinol percentage for improved absorption without causing irritation. This retinol booster helps refine pore size, diminish look of fine lines and wrinkles, even out skin tone and help stimulate collagen production. Begin use twice a week and increase frequency as tolerated.