Earth Science Maximum Hydration Hyaluronic Acid Serum - Discover the benefits of nature's miracle moisture binder. Hyaluronic Acid is an essential element in human skin. Because it can hold up to 1‚000 times its weight in water‚ it aids hydration and actually plumps up skin and helps to reduce the appearance of fine lines and wrinkles‚ making skin fresher‚ firmer and more youthful-looking with each use.