Hyaluronic acid (HA) has been called a “miracle molecule” for decades. It’s naturally found in the body—in joints, eyes, and skin—where it cushions, lubricates, and keeps tissues hydrated. Orthopedic surgeons inject HA into knees. Dermatologists inject it into lips and cheeks. Ophthalmologists use it in eye surgery. When placed directly inside the body, hyaluronic acid …
