ISDIN Isdinceutics Flavo-C Day and Night Antioxidant Serum Ampoules 2+2u is a combination of antioxidant serum during the day and repair serum at night. Flavo-C Ultraglican works to reduce oxidative stress, reinforce the skin structure and firmness, and hydrate the skin during the day, while Flavo-C Melatonin works as an antioxidant, increasing the skin’s natural defenses, as well as stimulating cell renewal and improving appearance.