HA should not be looked at as a cure. The body produces what you probably heard of called synovial fluid. It's the lubricant for all joints. A quality HA oral supplement does the same as an injection. It helps like oil on a bearing. Like oil, it doesn't refinish the bearing surface. IF the body has the raw materials and is laying down the "oil" consistently, things like pain and wear go away.
That's where other suppliments, habits and food/ diet mods come into their own.