How much caffeine is in espresso?

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Life is what happens when you are making other plans. (John Lennon)

Before roasting, a coffee bean has a caffeine content of somewhere between one percent and one and a half percent. \r\n\r\nA shot of espresso has about 100 mg of caffeine.

Caffeine is an alkaloid, so it adds a very bitter flavor to coffee.

Do you know that it would take 10 grams of caffeine or more (around 100 cups of coffee) to kill a healthy adult?\r\n\r\nTry to choose coffee with less caffeine or decaf sorts.

\r\n\r\nDoes this reply refer to caffeine anyway?\r\nThough I agree that caffeine adds bitter flavor to coffee.

I never think about caffeine etc. I only drink what I like.