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 mg of caffeine in 100g of coffee? I know 200 - 300 mg of caffeine (2 - 3 cups) is the ok limit, but I need to know how much this equates to.I put a lot into 1 strong cup so I might be reaching the limit with 1 cup.he serving size has 65 mg of caffeine, so you can calculate how much you're getting from that. For example, if you use twice the serving size per cup of coffee you're getting 130 mg of caffeine per cup. Source(s): http://www.verybestcoffee.com/Faqs/Taste... Somebody else Â· 8 years ago.