To keep it simple, black tea is fermented ... so a small difference in numbers reflects a bigger difference in acidity. For ...

L-theanine is also present, in lower concentrations, in black tea. There’s less research on the effects of coffee on stress, but researchers have found moderate to high amounts of caffeine are ...

One difference is that black tea leaves are first rolled and then oxidized ... for a caffeine boost that isn’t as strong as a cup of coffee. Green tea also contains more L-theanine, a calming ...