Hyaluronic acid is a humectant — a substance that retains moisture — and it is capable of binding over one thousand times its weight in water. This substance is naturally found in many areas of the human body, including the skin, eyes, and synovial fluid of the joints. HA used in beauty and skincare products is primarily made by bacteria in a lab via a process called biofermentation.
As we age, the production of key substances in the skin, including hyaluronic acid (along with collagen and elastin) decreases. As a result, our skin loses volume, hydration, and plumpness.