The Hydrate+ Serum is the first and only Hyaluronic Acid serum with patented Heparan Sulfate Analog (HSA) technology that delivers multi-level, long-lasting hydration, while alleviating the potential for irritation. This serum contains 4-forms of Hyaluronic Acid (HA), in both low and high molecular weights, that function as water replenishing sponges- providing both immediate and lasting multi-level hydration. Heparin Sulfate Analog (HSA) technology binds and retains water deep within the skin, supports healthy skin barrier function, and protects from inflammation caused by low molecular weight Hyaluronic Acid, allowing HA to provide optimal hydration delivery.