Hyaluronic Acid, A powerful humectant (moisture-binding ingredient) that keeps skin plump and hydrated. Our formula really takes years off by plumping your skin. Plump skin is younger looking skin. Hyaluronic acid is a naturally occurring polysaccharide (carbohydrate) in the human body. It’s present in large amounts in the spaces between skin cells, where it provides moisture, plumpness, firmness and suppleness to the skin.