Cold brew vs. hot brew tea has no bearing on caffeine content. Whatever the maker does to it in the manufacturing process has far more impact on the caffeine content of the final drink than whether it’s cold or hot brewed.
My body has some weird sensitivity to caffeine, so I switched from drinking Mountain Dew, a soft drink notorious for high caffeine content, to Lipton iced tea. My symptoms actually got worse. Then, I looked it up online and apparently the Lipton tea I was drinking actually has three times the caffeine of Mountain Dew.
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