I was about to post this question. Dr Levy recommends the following in his book, but finding such a multivitamin and one without calcium and iron is time-consuming.
A good supplementation program, in addition to vitamin C as ascorbic acid or sodium ascorbate, should include vitamin A (as beta carotene), vitamin E, and the B vitamins. However, B12 supplementation should be limited to documented states of ,deficiency, and hydroxycobalamin should be taken rather than cyanocobalamin to gradually restore B12 levels. Important antioxidants that can be added include alpha lipoic acid, coenzyme Q10, silibinin or silymarin, glutathione, and N-acetyl cysteine. Taking a variety of the important antioxidants has certain direct
benefits in addition to keeping vitamin C levels up by continuously converting oxidized vitamin C back to the metabolically active reduced form. Flavonoids, such as quercetin and rutin, are also important supporters of vitamin C's metabolic functions
Dr. Thomas Levy
Curing the incurable