Hyaluronic acid is a natural substance found in the fluids in the eyes and joints. It acts as a cushion and lubricant in the joints and other tissues. It also plays a crucial role in wound healing by controlling inflammation and redirecting blood flow to damaged tissue.

Hyaluronic acid is also the key chemical molecule involved in skin moisture due to its unique capacity in retaining water. Hyaluronic acid levels decrease as people age, and this may contribute to the physical signs of ageing, such as the appearance of wrinkles.