No7 Line Correcting Booster Serum visibly reduces wrinkles in one week.* It's formulated with MATRIXYL 3000 PLUS™, No7's next generation age-defying collagen peptide-based technology. Apply this serum before moisturizers, oils, primers and makeup. You can also use as a booster by mixing 1 or 2 drops into your moisturizer, eye cream or foundation to supercharge your favorite product with a boost of line-smoothing power. In 1 week using No7 Line Correcting Booster Serum, women saw a visible reduction in the appearance of lines and wrinkles on the forehead and around the eyes.