Citric acid, sodium citrate, aspartame (phenylketonurics: contains phenylalanine), magnesium oxide, maltodextrin, potassium citrate, contains less than 2% of sugar (adds a trivial amount of sugar), acesulfame potassium, calcium silicate, natural flavors, artificial color, lemon juice solids (adds a trivial amount of sugar), yellow 5.
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.