The Ordinary Hyaluronic Acid 2% + B5 is a hydration support formula featuring ultra-pure, vegan hyaluronic acid combined with vitamin B5. This lightweight serum provides multi-depth hydration through different molecular weights of hyaluronic acid for plumper, smoother skin. This formula contains three forms of hyaluronic acid with varying molecular weights and an HA crosspolymer at a 2% concentration to deliver hydration at multiple skin depths. The addition of Vitamin B5 enhances surface hydration. The serum should be applied before creams in AM and PM routines. As with any skincare product, patch testing is recommended before first use. The formula is water-based and suitable for all skin types.