How Much Caffeine in a Shot of Espresso + [Caffeine Calculator]

Espresso has 63mg of caffeine in 1 ounce. About 100mg is needed to produce the desired effects in humans, and headaches can start at 150mg or 200mg. Espresso is a concentrated form of coffee. A shot contains 1.5 ounces, which packs in more flavor and caffeine than the average cup of joe – but how … Continue reading How Much Caffeine in a Shot of Espresso + [Caffeine Calculator]