Hyaluronic Acid is a naturally occurring substance that can be found in your body and skin. It’s an acid that can hold up to 1000x its weight in water and it helps skin retain moisture. The benefit of using a Hyaluronic Acid Serum is that it will help moisturize, plump, and firm the skin. With continued use, wrinkles are less noticeable and the skin appears more youthful.