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Drink
Black tea
An oxidized tea brewed from Camellia sinensis. Contains caffeine and the polyphenol theaflavins.
Often discussed in relation to
Focus
A possible source of
Polyphenols
L-Theanine
Caffeine
Often considered alongside
Oolong tea
Drink
Rooibos tea
Drink
Green tea
Drink
Yerba mate
Drink
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