Hyaluronic Acid naturally occurs in the body. Known as the ‘goo that makes things go,’ hyaluronic acid is found in cartilage and joints and serves as a lubricant for joint movement. It is also found in extracellular space between cells, where it carries nutrients to cells. In the skin, it hydrates (moisturizes) by attracting water to itself, and is believed to be the agent around which new connective tissue is formed. Hyaluranate particles can be injected as a filler to plump skin, but when applied topically in solution, penetrates the skin where it attracts 1000 times its own weight in moisture to provide natural hydration.