Uriage H.A Booster Serum 30ml is a hydrating serum that tackles signs of dehydration. For this purpose, this serum features a unique formula that combines Hyaluronic acid, Aquaxyl, Marshmallow Flower Extract, and, evidently, Uriage Thermal Water. Hyaluronic acid is present in 1.5% to deeply hydrate and plump the skin. Then, Aquaxyl and Marshmallow Flower extract help boost hydration and protect the skin from external aggressions. In fact, this serum promotes the skin's natural defense system.