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Energy drinks usually contain many ingredients, here are some of the most common energy drink ingredients: caffeine: the main component of various types of energy drinks, it is a natural stimulant for the brain and the nervous system. Most energy drinks contain about 70 to 240 mg of caffeine (a 355 ml can of soda contains about 35 mg of caffeine). Guarana: is a plant extract that is a strong source of caffeine, and may help relieve muscle pain. Ginseng: is also a plant extract, with positive effects on brain functions. B complex vitamins: help the body absorb food and convert it into energy. Amino acid derivatives: such as taurine and L-theanine, which play an important role in controlling many metabolic processes in the body. Sugar: is the main source of calories in energy drinks. The calories in energy drinks range from 110 to 220 calories.