Black TeaCamellia sinensis
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Black and green tea are made from the same plant, but black tea has been allowed to oxidize, altering its constituents. While green tea is high in catechins (especially epigallocatechin gallate, or EGCG), black tea contains relatively high levels of theaflavins, theanine, and thearubigens. Although
What Is Black Tea Used for Today?
According to some but not all observational studies
Unfortunately, observational studies are notoriously unreliable for proving the efficacy of a treatment. Some additional support comes from animal studies that hint black tea may help prevent
A much larger study (more than 200 participants) evaluated a form of green tea enriched with black tea theaflavin.
Theanine, a component of black tea, has been advocated as a
Other preliminary evidence from small trials suggests that the consumption of theanine in black tea may reduce the body's response to
Black tea might also help
Though black tea has shown blood-sugar-lowering effects in healthy people,
As an extraordinarily widely consumed beverage, black tea is presumed to have a high safety factor. Its side effects would be expected to be similar to those of coffee—heartburn, gastritis, insomnia, anxiety, and heart arrhythmias (benign palpitations or more serious disturbances of heart rhythm). 14 All drug interactions that can occur with caffeine would be expected to occur with black tea.
Interactions You Should Know About
If you are taking:
17. Mackenzie T, Leary L, Brooks WB. The effect of an extract of green and black tea on glucose control in adults with type 2 diabetes mellitus: double-blind randomized study. Metabolism. 2007;56:1340-1344.
19. Rogers PJ, Smith JE, Heatherley SV, et al. Time for tea: mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together. Psychopharmacology (Berl). 2007 Sep 23. [Epub ahead of print]
22. Alemdaroglu NC, Dietz U, Wolffram S, et al. Influence of green and black tea on folic acid pharmacokinetics in healthy volunteers: potential risk of diminished folic acid bioavailability. Biopharm Drug Dispos. 2008 Jun 12.
Last reviewed April 2009 by EBSCO CAM Review Board
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