Why can't we resist drinking Coca Cola? Truth is, we're addicted to the soda that contains caffeine and big amounts of sugar. If you read the label of Coke, you'll find its ingredients like carbonated water, caramel color, cane sugar, food acid (or phosphoric acid 338), caffeine and "flavor." And speaking of flavor, did you know that Coca Cola has a secret ingredient named 'Merchandise 7X'? The ingredient's description is kept secured inside a security vault located in Atlanta, Georgia. Just a few selected officials know the content of this controversial 'secret ingredient'. It sounds a bit creepy to many but definitely, that doesn't make us say NO to Coke, at all.