Black tea and green tea may boost microcirculation
Antioxidants unique to black tea, called theaflavins, and catechins found in green teas, may boost circulation in the smallest blood vessels in the body. In this study, 24 healthy older adults took a placebo, 100 mg to 500 mg of theaflavins, or 500 mg of catechins, in a single dose. Doctors measured microcirculation before and two, four, and six hours after the dose.

Participants who took 500 mg of theaflavins or 500 mg of catechins had better circulation compared to placebo. Microcirculation is blood flow in the tiniest vessels embedded in the organs of the body. Because they are so small, they are easily damaged. Doctors said results of this study suggest the antioxidants in green and black tea may help protect the smallest blood vessels in the body.

Reference: Nutrients. 2014 Dec 11;6(12):5772-85.
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