Why is caffeine so important? Because of its mild stimulating properties on the body and mind. Caffeine is the stuff that perks you up when you drink a cup of coffee. The body absorbs it rapidly, usually within 30 minutes, and its effects may last for 2-5 hours.
300 mg of caffeine per day is considered moderate caffeine consumption for most people. This translates to about 5 cups of soluble coffee or 3-4 cups of brewed coffee. However, some individuals may choose to consume decaffeinated coffee, tea, or soft drinks, especially later in the day.
Caffeine was discovered by two different scientists almost at the same time. It was first isolated in coffee by a German chemist in 1820. In 1821 a French chemist, working independently, discovered the same element and gave it its name.