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“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.”
Evidence-based complementary and alternative medicine : eCAM • 2014 | View Paper
“Clinicians should have a heightened awareness of the potential for elevated international normalized ratio when grapefruit juice is consumed in a patient who is taking warfarin.”