Herbs affect chemotherapy. Black cohosh, often recommended to breast cancer patients to relieve menopausal symptoms, changes the potency of some chemotherapy drugs.

Self-defense: Be sure your doctor knows all of the supplements and over-the-counter remedies you take.
To check interactions, go to the MedlinePlus Website (www.nlm.nih.gov/medlineplus) and click on "Drugs and Supplements."

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