Lasting joint pain relief for 67yo Mother?

Take a couple of Apple cider vinegar pills every day. I find them in the store near diet products. That is how I found out, quite by accident, that they work. (didn't do anything for a diet, however) That is all I take except an occasional Tylenol. I am 66y have had a couple of scopes on both knees that didn't do any good. Also had the series of cartilage shots in both knees. Only worked on one. This is all that has ever worked for any period of time. Worked on my ex too. Just make sure she takes them with food.