I have some osteoarthritis and have been doing daily cod liver oil capsule and glucosamine for the past 12 years. May not make any difference but I can report that I am probably more mobile in my hip joints than I was when I was working. But this could equally be due to retirement reducing stress by miles, now daily walk with the dog, weekly Pilates session and general enjoyment of life! Dare not stop the supplements just in case, but at 67 would regard myself as very healthy, carrying a little too much weight ((wish I could lose a stone). Have not been near the doctor, except for annual flu jab, for a couple of years and intend to keep it that way for a long time yet.
Eat well, not too much, exercise a bit every day preferably in the fresh air and enjoy life. Seems to work so far.