black tea packs

How Much Caffeine Is In An Iced Black Tea?

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An average cup (237 ml) of black tea packs 47 mg of caffeine but can contain as much as 90 mg. For comparison, green teas contain 20–45 mg, while white teas deliver 6–60 mg per cup (237 ml) (12, 13 , 14). Matcha green tea is another high-caffeine tea. Is iced tea high in caffeine? … Read more