Black tea contains a group of polyphenols that have antioxidant properties. Consuming antioxidants may help decrease the risk of chronic disease and improve your overall health. Black tea contains flavonoids, which are beneficial for heart health. Studies have found that regularly drinking black tea may help reduce the risk of heart disease. High blood pressure can cause many health complications. Drinking black tea on a regular basis may help decrease systolic and diastolic blood pressure, but research is mixed.