Hyaluronan, also known as hyaluronic acid, is a naturally occurring substance found in the body, particularly in connective tissues, skin, and synovial fluid. It plays a crucial role in retaining moisture, providing lubrication, and supporting tissue hydration. Due to its unique ability to hold water, it is often used in skincare products and medical treatments. In addition to its cosmetic applications, hyaluronan is utilized in various medical fields, including orthopedics and ophthalmology. It can be injected into joints to alleviate pain in conditions like osteoarthritis and is also used in eye surgeries to maintain moisture and protect tissues.