The kidneys are the main organs of the urinary system. They function chiefly to filter blood in order to remove wastes and excess water. The waste and water are excreted as urine. The kidneys also reabsorb and return to the blood needed substances, including amino acids, sugar, sodium, potassium, and other nutrients.
But many popular brands actually contain considerably less than an old-fashioned cup of black coffee. An 8.4-ounce serving of Red Bull, for instance, has a relatively modest 76 to 80 mg of caffeine, compared to the 95 to 200 mg in a typical cup of coffee, the Mayo Clinic reports.
How many milligrams of caffeine are in a cup coffee how much is coffee? Center for science the public interest. That 8 ounce cup of coffee has about 100 milligrams caffeine, although coffees and one 250ml can red bull energy drink contains 80 mg the same amount as in a standard. If your caffeine habit totals more than 400 milligrams (mg) a day, you may want to keep in mind that the actual conten