6. Chai tea Chai tea is a type of black tea blended with strong herbs and spices. Though it contains less caffeine (48 mg) than coffee, studies suggest that black tea may still improve mental ...

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For better focus, less jitteriness and improved gut health, try green tea -- a lower-caffeine alternative to coffee.

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and black teas infused with green tea caffeine, give you the same kick as coffee, but with smoother, more balanced energy,” says Hartmann.