Generally, coffee grown at low altitudes has less caffeine than high altitude coffee. Robusta coffee has considerably more caffeine than arabica coffee, but less 'coffee' flavor. In addition, the roasting time affects how much caffeine is present in coffee, with lighter roasts having more caffeine. The darker the roast, the less caffeine makes its way into the final brewed coffee.
Caffine also has a nasty effect on bladder.
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