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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.
Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision. Retinol, the form of vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble substance. 2  Since the pure alcohol form is unstable, the vitamin is found in tissues in a form of retinyl ester. 3  It is also commercially produced and administered as esters such as retinyl acetate or palmitate.