Energy drinks provide functional benefits by boosting energy and alertness. The functionality is obtained from ingredients such as glucose, caffeine or taurine.
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Energy is traditionally obtained from sugars; typically sucrose and glucose, and stimulant energy from caffeine, taurine and other ingredients including glucuronolactone, inositol and B vitamins.
Energy drinks that have a high caffeine content are legally required to be labelled as having a high caffeine content. Since 2010, the BSDA has operated a voluntary Code of Practice agreeing not to market or promote products to under 16s.