Black tea is known to have the most caffeine of the various tea types, with as much as 60-90 mg per 8-oz serving. Oolong contains approximately 50-75 mg of caffeine per 8-oz serving. Green tea usually has 35-70 mg per serving, whereas yellow and white teas have the least amount of caffeine at 30-55 mg.
Learn more about the neurologic effects of caffeine.
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Cite this: Elwyn C. Cabebe. Fast Five Quiz: Tea and Health - Medscape - Aug 03, 2022.