Hyaluronic acid is a natural substance used for skincare and health. It is a polysaccharide (glycosaminoglycan) found in the body and is present in various areas such as the eyes, skin, joints, and synovial fluid.

In skincare, hyaluronic acid is a popular ingredient due to its moisturizing properties. When applied to the skin, it hydrates, plumps, and smoothes the skin. It also helps reduce the appearance of fine lines and wrinkles.

Hyaluronic acid is also important for joint health. Found in joint fluid, it can increase joint mobility and reduce joint pain and stiffness. Therefore, hyaluronic acid is used in the treatment of joint conditions like osteoarthritis.

In conclusion, hyaluronic acid is considered an important component for skin and joint health.