Neutrogena’s Hydro Boost renews skin’s hydration levels by replenishing water and strengthening skin’s moisture barrier, resulting in hydrated, smooth, supple skin with help of the following ingredients: Purified hyaluronic acid acts like a sponge for dry skin cells, absorbing up to 1000 times its weight in water, progressively releasing water back into skin, Olive extract, similar to your skin’s natural moisture barrier, it integrates into the skins barrier to fortify and protect it from excessive moisture loss and Glycerin rebuilds lost mortar in the brick wall of your skin cells and replenishes the moisture barrier.