“The most beneficial for the heart are complexes of tannins with caffeine (caffeine tannate), which dilate blood vessels, relieve spasms, and normalize blood pressure. And also catechins, which strengthen capillaries,” says Mikhail Goncharov.

A study by Guilan University of Medicine in Iran found that regular tea consumption (especially green tea) can reduce systolic (upper) blood pressure by 3 mmHg and diastolic (lower) blood pressure by 1 mmHg. However, for a significant effect, the tea must be drunk for more than three months./