Caffeine is a natural stimulant. However, some claim it interferes with the absorption of certain nutrients, such as iron. Caffeinated foods and beverages have become staples in most modern-day diets.
In comparison, drip coffee ranges from around 12 to 16 milligrams of caffeine per ounce. How much caffeine is in your morning cup is more complex. After all, when was the last time you sipped a ...