The 23 ingredients that comprise Dr. Pepper have been speculated upon for decades. One of the ugly rumors spread about the soda is that it contains prune juice. While this is not in fact one of the components, the others are up for debate, but most probably include cola, vanilla, cherry, orange, caramel, and lemon amongst others. On the company’s FAQ website, the question of flavor is answered rather cryptically: “Dr. Pepper is a unique blend of 23 flavors. The exact formula for Dr. Pepper? That’s top secret proprietary stuff.”