There are some good tips in this thread. I've tried most of the things mentioned, I've been a health nut for over 30 years trying to eat right and take vites and supps and I think it made a lot of difference. I suspect that is why I did not come down with cfs symptoms earlier in life and managed to delay the onset
For arthritis take glucosamine and chondroitin. If you have bad arthritis you will have to take a much higher dose than the bottle says. I take 4 x triple strength gl + ch per day. It works well, I have other things that help with arthritis including ultrasound and deep red laser
Everyday I take E, B complex, C, D, K2, magnesium, blueberry extract, garlic extract, curcumin, creatine, l glutamine, and a lot of other things, about 50 different per day. Yes, it costs money but I would not take back the thousands I spent over the years because the benefit has been well worth it. If I delayed the onset of the disease by 20 years, which is possible, then that is worth more than money. I never get colds, never got the flu except about 5 years ago I got covid but it went away fast
Taking the right kind of E and D is important, E complex is much better than cheap E which is all one variety, E has several sub types and you need them all. D3 is the best form of D.
If you don't have loads of cash to spend on vites and things that might or might not help, a multivitamin is a decent alternative to taking so many things separately. You get a little of everything and it only costs maybe 25 cents a day