How Much Caffeine is in a Cup of Coffee?
Cup of Coffee
The active ingredient in coffee is caffeine, the most commonly consumed psychoactive substance in the world.
The caffeine content in a cup of coffee is highly variable, ranging from 50 to 400+ mg per cup.
A small home-brewed cup of coffee could contain 50 mg, while a big 16 oz Starbucks grande can contain over 300 mg.
As a general rule, you can assume that an average 8 ounce cup of coffee contains around 100 mg of caffeine.
Several sources suggest that 400 mg of caffeine, or 4 cups of coffee, are safe for most healthy adults.
However, many people (including myself) drink much more than that without any issues.
Keep in mind that there are many other sources of caffeine besides coffee, including tea, soft drinks, energy drinks, chocolate and certain medications.
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