Friendliest.app says
Frozen Coca-Cola® is free of all the top 8 food allergens - gluten/wheat, milk, fish, shellfish, peanuts, tree nuts, eggs and soy.

Ingredients: Carbonated Water, High Fructose Corn Syrup, Caramel Color, Phosphoric Acid, Natural Flavors, Caffeine, Quillaia Extract, Yucca Extract.