The Neutrogena Hydro Boost Hydrating Serum is a popular choice for Amazon Prime Day. This serum is formulated with hyaluronic acid, which helps to replenish and lock in moisture, leaving your skin hydrated and supple. It also contains glycerin, which helps to improve the skin's moisture barrier and prevent moisture loss. The lightweight, non-greasy formula absorbs quickly into the skin, making it suitable for all skin types. With regular use, you can expect to see a noticeable improvement in the overall hydration and texture of your skin.