The caffeine content of these products varies from 5 to 40 mg per ounce, and a single serving (8 to 24 ounces 235-710 mL) may contain up to 300 mg of caffeine. Popular brands include Red Bull, Monster, Rockstar, NOS Energy, Xyience, Bang, Celsius, Zevia, Full Throttle and Kick Start. The commercial products vary greatly in concentration of caffeine as well as in other characteristics, such as carbonation, flavoring, sugar and sweeteners, vitamins, minerals, amino acids and botanical ingredients. Energy drinks were first marketed in the late 1990s and have subsequently become popular and widely available.
Energy drinks are defined as beverages with high concentrations of caffeine that are purported to boost energy, physical and athletic performance and mental alertness.
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