According to multiple sources, the 23 flavors in Dr Pepper are:

• Cola
• Cherry
• Licorice
• Amaretto (almond, vanilla, blackberry, apricot, blackberry)
• Caramel
• Pepper
• Anise
• Sarsaparilla
• Ginger
• Molasses
• Lemon
• Plum
• Orange
• Nutmeg
• Cardamon
• Allspice
• Coriander
• Juniper
• Birch
• Prickly ash

It is worth noting that the exact combination and amounts of these flavors are a closely guarded secret, and the ingredients list on the can only lists "natural and artificial flavors". While there are many theories and rumors about the specific flavors and their proportions, the true recipe remains unknown to the public.