Many wine lovers assume that Red Wine Headaches (RWH) has something to do with sulfites, but it is more likely that other element is responsible since less than one percent of the population is sensitive to sulfites. Tannins are another popular hypothesis. Tannins are found in the skins, stems, and seeds of grapes, as well as the oak wood barrels and casks used for aging. And therein lays the rub.
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