'Everything will be fine once caffeine kicks in', is a common belief among tea coffee lovers. But do you know exactly what is caffeine? Caffeine mostly found in tea, coffee, cola and some chocolates is a type of drug that stimulates the nervous system of our body. Caffeine in Espresso has certain benefits and side effects. The content of caffeine in Espresso is 75.00 mg. Caffeine can be effective on headaches and can increase alertness but, very high doses of Espresso caffeine can have adverse effects on our body. So, Espresso caffeine content should be as low as possible. Also, get to know caffeine content of other products like Espresso vs Affogato, Cappuccino vs Affogato.