Citric acid, aspartame (phenylketonurics: contains phenylalanine), natural and artificial flavors, maltodextrin (adds a trivial amount of sugar), red 40, contains 2% or less of the following: acesulfame potassium, ascorbic acid (vitamin c), magnesium oxide, monocalcium phosphate, blue 1.
Manufacturer likely did not include an allergen statement; however, please double-check the product packaging and/or contact the manufacturer if you have a severe food allergy.