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constipation, bloating, and nausea. It can also cause allergic reactions involving rash and itching in some people. Long-term use of high doses of soy dietary supplements might not be safe. There is concern that taking high doses might cause abnormal tissue growth in the uterus.
Do not take soy in amounts greater than what is normally found in foods if:
Report Problems to the Food and Drug Administration
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.