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Sulfur dioxide is added to wine to help control microbiological activity.
A certain amount of sulfites are also naturally present, as they are in most fruits. Free sulfites are very low in wine. In fact orange juice, salad bars and dried fruits each contain many more parts per million of sulfites than wine does. Sulfite sensitivity is very rare, if you think you suffer from this, contact your doctor. It seems there are those who would make wine illegal again.