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Hyaluronic acid is a naturally occurring substance found in the human body. It is a type of glycosaminoglycan, a long unbranched polysaccharide. Hyaluronic acid plays a crucial role in various biological processes, including tissue hydration, lubrication, and cell signaling.

In the skin, hyaluronic acid is a key component of the extracellular matrix, helping to retain moisture and maintain skin's suppleness and elasticity. As a humectant, it attracts and binds water molecules, contributing to a hydrated and plump appearance. Its presence is vital for wound healing and tissue regeneration.

Beyond its presence in skin, hyaluronic acid is also abundant in connective tissues such as cartilage, joints, and the eyes. In the joints, it acts as a lubricant and shock absorber, reducing friction between bones and protecting them from damage. This property makes it a target for treatments aimed at alleviating joint pain associated with conditions like osteoarthritis.

Due to its hydrating and viscoelastic properties, hyaluronic acid has found widespread use in cosmetic and dermatological applications. It is a common ingredient in moisturizers, serums, and dermal fillers, aiming to improve skin hydration, reduce the appearance of wrinkles, and restore lost facial volume. Medical applications also include its use in eye drops for dry eye syndrome and in surgical procedures.