text:  are going to have more bone wear. So what you need is the actual cushioning back there to lubricate the joint, and that's what HA does. That's what HA is. The doctors call it synovial fluid. They actually inject this into joints. Orthopedists do. Dermatologists inject it into the skin. Eye doctors use it as a lubricant during eye surgery. So it's nothing foreign to modern medicine, but it may be new to you as a listener there.