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.
For the sake of comparison, a 12 oz. Pike Place contains 260mg of caffeine, and a 12 oz. Starbucks Doubleshot On Ice has 150mg of caffeine. So basically, the Nitro Cold Brew isn't quite as strong as hot coffee, but it's still one of the more caffeinated iced beverages on Starbucks' menu.