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.
So if you are one of those people, McDonaldâs has a great option to get a caffeine fix while keeping your sugar down-McDonaldâs Sugar Free Vanilla Iced Coffee. Around 2008, McDonaldâs joined the beverage battle against Starbucks and began offering iced coffees such as hazelnut, caramel, and regular vanilla.he Bottom Line. With only 1-2 grams of sugar, McDonaldâs Sugar Free Vanilla Coffee is a home run.