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5 Replies. The most commonly deficient vitamins for people dealing with rheumatoid arthritis are vitamin C, vitamin B6, folate (vitamin B9), vitamin D, vitamin B12 and vitamin E. It is preferable to get these vitamins in your diet however if that is not possible then supplements can be used.
5 Replies. The most commonly deficient vitamins for people dealing with rheumatoid arthritis are vitamin C, vitamin B6, folate (vitamin B9), vitamin D, vitamin B12 and vitamin E. It is preferable to get these vitamins in your diet however if that is not possible then supplements can be used. Folate (Folic Acid/ Vitamin B9) is not stored in the body so it is important to get a daily dose. 2  Folate deficiency can cause anemia, weight loss, loss of appetite, and diarrhea. 3  Folic acid is used to manufacture red blood cells. 4  It can be found in leafy green vegetables such as spinach and turnips greens.