b vitamins

coffee + vitamin b1

Coffee and tea were historically labeled antithiamine beverages, but later biochemistry walked the claim back: chlorogenic and caffeic acids do not destroy thiamine under physiological conditions, and the real activity comes from polyphenol oxidation products and tannins, which are lower in coffee than tea. The net effect on thiamine status is modest and unlikely to matter for well-nourished people; it becomes relevant only on a marginal diet or in groups already prone to deficiency.