Caffeine Content by Drink and Daily Guidelines
The FDA recommends a maximum of 400mg of caffeine per day for healthy adults. A 12oz Americano contains about 150mg, a shot of espresso about 64mg, and a standard 8oz energy drink about 80mg. Exceeding the limit can cause anxiety, rapid heartbeat, and sleep disruption.
Special Populations
Pregnant women should limit caffeine to 200mg daily — roughly one medium coffee. Children and teens should consume significantly less. People sensitive to caffeine may experience effects at lower doses.
Frequently Asked Questions
Drip coffee and espresso-based drinks generally have more caffeine per serving than energy drinks. However, energy drinks often contain other stimulants that amplify the effect.
Symptoms include jitteriness, anxiety, rapid heartbeat, headache, and insomnia. Very high doses (1,000mg+) can cause serious health issues requiring medical attention.