Soft drinks with ingredients meant to enhance or maintain the consumer’s physical energy, typically caffeine, sugars and sometimes taurine or B vitamins. Quality and safety concerns include high caffeine and sugar content, labelling accuracy and consumption by children and adolescents. Typical products contain 80–300 mg of caffeine per serving alongside 25–35 g of sugars, and regulators in several countries restrict sales to minors and require high-caffeine warnings. Adverse-event reports link excessive consumption to cardiovascular and neurological effects, prompting ongoing review of maximum caffeine levels and marketing practices.