Hyaluronic acid, also known as hyaluronan, is a clear, gooey substance that is naturally produced by your body. The largest amounts of it are found in your skin, connective tissue, and eyes. Its main function is to retain water to keep your tissues well lubricated and moist.
As we age Hyaluronic acid is less produced naturally sometimes age is a factor and our lifestyle as well so we get Hyaluronic acid externally on our skin.