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“We describe the case of a 70-year-old woman who, while being treated with warfarin , was admitted to hospital with multiple internal hemorrhages after having used chamomile products (tea and body lotion) to soothe upper respiratory tract symptoms.”
Canadian Medical Association Journal • 2006 | View Paper
“Among thirty-eight herbs, Cannabis, Chamomile , Cranberry, Garlic, Ginkgo, Grapefruit, Lycium, Red clover, and St. John's wort were evaluated to have major severity interaction with warfarin.”