To answer your question, the same amount of caffeine is released regardless of amount of water. But it isn’t actually, “the longer tea is brewed, the more caffeine will collect in the water”. I found out from my OBGYN while I was pregnant that the vast majority of the caffeine is released in the first 30-45 seconds of steeping tea. So (shudder, please, all tea purists), I would steep tea for 45 seconds, throw it out, and then re-steep to get my morning tea in. Could I have just purchased decaf tea? Yes, but it was easier to just keep using the tea that my husband and I both liked.
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