Hemoglobin: The oxygen-carrying pigment and predominant protein in the red blood cells. Hemoglobin forms an unstable, reversible bond with oxygen. In its oxygenated state it is called oxyhemoglobin and is bright red.
Caffeine by McDonalds Iced Coffee Size. 1  Medium (16 floz): 133mg. 2  Large (22 floz): 200mg. 3  Extra Large (32 floz): 320mg.
McDonaldâs also has Dunkinâ beat as far as cost per milligram of caffeine is concerned, offering slightly less caffeine than its competitor, Starbucks. But we should note that McDonaldâs coffee is also cheaper coming in around $1 for a small cup (12 oz.) cup of coffee.