What it is: A lightweight liquid nighttime treatment serum that helps reduce the appearance of fatigue and puffiness.What it does: It smoothes away visible signs of tiredness so you wake up looking rested and revitalizes. It's Guerlain's secret to looking rested after a long night, and is formulated with eight effective ingredients that help reduce signs of fatigue and puffiness.Research results:In a use test conducted on 33 people:- 79% noted skin felt refreshed, as if you had slept two extra hoursHow to use: Apply alone all over a cleansed face and neck at night. 0.5 oz. Paraben-free; alcohol-free Made in France