Grapes are usually treated with sulfur dioxide to preserve their color and extend shelf life. They should always be washed before eating. People with asthma should avoid grapes or look for grapes that have not been treated with sulfur.
Grapes naturally contain salicylates, the major ingredient in aspirin, so people who are allergic to aspirin may react to grapes and products make from them.
Organic grapes doesn't mean they are not treated with sulfur dioxide, as grapes are still considered organic with sulfur applied to them.
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