Coffee contains hundreds of bioactive compounds. In fact, it’s the single largest source of antioxidants for many people.

Studies also show that coffee drinkers have a lower risk of conditions like type 2 diabetes, neurological disorders, and liver diseases.

Caffeine, an active ingredient in coffee, is the most commonly consumed psychoactive substance in the world.

Coffee’s caffeine content is highly variable, ranging from 50 to over 400 mg per cup.

A small home-brewed cup of coffee could provide 50 mg, while a 16-ounce (475-ml) Starbucks grande packs over 300 mg.

As a general rule, you can assume that an average 8-ounce (240-ml) cup of coffee offers around 100 mg of caffeine.

Several sources suggest that 400 mg of caffeine per day — the equivalent of 4 cups (945 ml) of coffee — is safe for most healthy adults.

However, many people drink much more than that without any issues.

Keep in mind that many other sources of caffeine exist, including tea, soft drinks, energy drinks, chocolate, and certain medications

The caffeine content of your morning joe can range from 50 to over 400 mg. Many sources recommend 400 mg of caffeine per day as the safe upper limit for healthy adults.