Adverse side effects of caffeine are generally dose related and can include nervousness, irritability, insomnia, headaches, rapid heartbeat, tremor, and gastrointestinal discomfort. Caffeine in typical amounts is well tolerated and not associated with significant side effects or long term adverse outcomes. Caffeine has been shown to have psychoactive properties and to increase alertness and wakefulness and improve physical and athletic performance, although to a minor degree and with considerable inter-individual variability. The average caffeine content in selected energy drinks and soft drinks is shown in the table below. Caffeine is also present in regular soft drinks but generally in amounts similar to tea (2 to 5 mg/oz and 24 to 60 mg per 12 oz can), although soft drink brands with extra caffeine have also become popular (Pepsi Max, Jolt Cola, Mountain Dew Energy).
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. There are 87.3 g of water in a 100 g portion of energy drink full throttle.Energy drinks are defined as beverages with high concentrations of caffeine that are purported to boost energy, physical and athletic performance and mental alertness. The same serving of energy drink full throttle (100 grams) contains 0 mg of phosphorus, 35 mg of sodium, 0 mg of zinc, 0.2 micrograms of selenium, and 0.005 milligrams of copper. There are 13 mg of calcium, 0.02 mg of iron, 3 grams of potassium, and 3 micrograms of magnesium in 100 g of energy drink full throttle. In 100 grams of energy drink full throttle, there is 0.3 mg of choline, 0 mcg of carotene beta, 0 mcg of carotene alpha, 0 mcg of lycopene, and 0 mcg of vitamin K. Food folate in 100 grams ratio of energy drink full throttle amounts to 0 mcg while Dietary Folate Equivalents (DFE) is 0 mcg. The same serving of 100 grams of energy drink full throttle contains 0.025 mg of thiamin (B1), 0 mg riboflavin (B2), 1.667 mg niacin (B3), 0.167 mg of vitamin B6 and 0 mcg of folate (B9). Energy Drink Full Throttle has 0 mcg of vitamin A, Retinol Activity Equivalents (RAE), as well as 0 mg of vitamin C in 100 grams.
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