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The longer tea steeps, the greater the quantity of health-boosting flavonoids. Here's more proof that bigger isn't always better: Several recent studies show that sometimes the smallest changes (like how you brew your tea or when you schedule a medical exam) can have a huge payoff when it comes to improving your health.
One study of the caffeine content of teas (after steeping) found that the caffeine content of tea varied from about 3 mg/g to 30mg/g, which would result in a cup of tea containing between 7.5 mg and 75 mg of tea.