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For most healthy adults, up to 400 mg of caffeine per day—roughly four cups of brewed coffee—is generally considered safe.

As of 2025, a standard 5-hour ENERGY shot contains 200 mg of caffeine, while the Extra Strength version contains 230 mg (costs vary by year and location)..

The American Academy of Pediatrics recommends no caffeine for children under 12 and a maximum of 100 mg per day for adolescents ages 12 to 18.

A standard 8.4 fl oz (250 ml) can of Red Bull contains 80 mg of caffeine, roughly the same as a small cup of coffee.

Health experts recommend that teenagers ages 12 to 18 should consume no more than 100 mg of caffeine per day.

A 12-ounce can of Diet Coke contains 46 mg of caffeine — about 35% more than regular Coca-Cola but far less than a typical cup of coffee.

Brewed coffee typically contains about 95 mg of caffeine per 8-ounce cup, while black tea has roughly 47 mg — but the actual amount varies depending.

Most healthy adults can safely consume up to 400 mg of caffeine daily, roughly the amount in four cups of brewed coffee, according to FDA guidelines.

Only about 1% to 1.5% of the caffeine a breastfeeding parent consumes passes into their breast milk.

Matcha contains roughly 19 to 44 mg of caffeine per gram of powder, with a typical 2-gram serving providing 38 to 88 mg of caffeine depending.