what vitamins and minerals work together?
['Vitamin D and calcium. Like most nutrients, calcium is absorbed primarily in the small intestine. ... ', 'Sodium and potassium. About 90% of the sodium we ingest comes in the form of sodium chloride — salt, in common parlance. ... ', 'Vitamin B12 and folate. ... ', 'Zinc and copper. ... ', 'Niacin and tryptophan.']