Neutrogena Hydro Boost Hyaluronic Acid Serum is a potent serum that delivers intense hydration to your skin, leaving it looking smoother and more radiant. This serum is infused with hyaluronic acid, which is naturally found in the skin and can hold up to 1000 times its weight in water. It helps to boost skin's hydration level and lock in moisture to keep it looking plump and supple. This serum is suitable for all skin types and can be used alone or under your moisturizer for a boost of hydration.