Vitamin B3 (niacin or niacinamide) 0.5 โ 2 grams 3 times daily. Vitamin B6 (for many) 250-500 m.g. daily. A general B vitamin formula. Vitamin C, 3 or more grams daily. Zinc (gluconate or citrate) 50 m.g. daily. Manganese 15-30 m.g. daily (if there is danger of tardive dyskinesia).