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diarrhea, and low thyroid.
When used on the skin, horseradish is possibly safe when preparations containing 2% mustard oil or less are used, but it can cause skin irritation and allergic reactions.
Horseradish is UNSAFE when used in children less than four years of age or in pregnant or breast-feeding women.
Do not use horseradish if:
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.