MiO products state they use no artificial flavors, but are artificially colored and sweetened with concentrated syrups.[3] MiO Energy contains 60 milligrams of caffeine per serving. With the exception of Canadian varieties, all contain propylene glycol.[4]
MiO is listed as having less than 2 % of natural flavors. Other listed ingredients are citric acid, propylene glycol, malic acid, sucralose, acesulfame potassium, potassium citrate, Allura Red AC 40, Brilliant Blue FCF 1 and potassium sorbate. Red 40 is banned in some European countries and is not recommended for children. Blue1 has been banned in a number of European countries.[citation needed]