Hyaluronic acid (HA) is a naturally occurring glycosaminoglycan found throughout the human body, most notably in the skin, joints, eyes, and blood vessels. It is a key player in hydration, lubrication, and tissue integrity. As our natural levels decline with age, supplementation has gained traction in dermatology, rheumatology, ophthalmology, and beyond. Below is an overview of the many health benefits of HA supplementation, along with practical guidance for use.