The Hyaluronic Acid 2% + B5 Hydration Support Formula Duo unites two bottles of the high-performance treatment that works to hydrate & nourish your complexion. Formulated with three types of hyaluronic acid (at low, medium & high molecular weights) the lightweight serum seeks to visibly plump & firm the skin, while helping to lock in moisture. The lightweight serum leaves skin feeling silky-soft & encourages an illuminating glow.