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"Sip on hibiscus tea. Hibiscus tea can lower high blood pressure by as much as 7 points. This is because of the phytochemicals present in hibiscus. If you enjoy herbal teas, you can find many blends that contain hibiscus. For the best results, choose a blend that lists hibiscus as one of the top ingredients.\nSince caffeine can constrict your blood vessels and worsen high blood pressure, it's a good idea to avoid herbal teas that contain caffeine."
<https://www.wikihow.com/Control-High-Blood-Pressure>