Methemoglobinemia is a blood disorder in which an abnormal amount of methemoglobin -- a form of hemoglobin -- is produced. Hemoglobin is the protein in red blood cells that carries and distributes oxygen to the body.
Caffeine. One 8-ounce cup of coffee has 95 milligrams of caffeine and a 1-ounce single shot of espresso has 64 milligrams. Consuming too much caffeine can make you restless, anxious and irritable. It can also interact with certain medications. Pregnant women may need to cut back on caffeine consumption.
Decaffeinated isnât the same thing as caffeine-free. An independent lab test of Starbucks coffee showed the following: Decaf Brewed Coffee â 12.0â13.4 mg/16 fl oz serving (Starbucks have decided to list considerably more caffeine than this â 25mg per 16 fl oz). Decaf Espresso â 3.0â15.8 mg/shot.