In January 2020 researchers from Poland published the results of their study to assess the content and antioxidant properties of 24 popular classic and fruit energy drinks. The content of the energy drinks, especially caffeine and sugar, and antioxidant properties (antioxidant capacity, total polyphenols, total anthocyanins, vitamin C) were analyzed. Results showed that energy drinks with added fruit juice or natural pigments had a significantly higher antioxidant capacity compared to classic energy drinks. Fruit energy drinks had a higher concentration of polyphenols and vitamin C. In some fruit energy drinks, small amounts of anthocyanins were found. Normally, energy drinks do not contain many polyphenols and are not distinguished by a high antioxidant capacity. However, fruit energy drinks and/or ones with added natural pigments have a higher amount of antioxidants than classic energy drinks. Both classic and fruit energy drinks contain a large amount of caffeine and sugar; therefore, it would be advisable not to drink a large amount of energy drinks because of possible health issues.
Nowak D, Gośliński M. Assessment of Antioxidant Properties of Classic Energy Drinks in Comparison with Fruit Energy Drinks. Foods. 2020 Jan 7;9(1). pii: E56.