Energy drinks are mostly two things: caffeine and sugar, dressed up in a lab coat. Caffeine content varies wildly — from around 80 mg to 300 mg per can, versus roughly 95 mg in a cup of coffee — and the sugar in a full-size can often rivals soda. The mysterious 'energy blend' ingredients mostly circle back to caffeine too: guarana is simply a plant source of more caffeine, which can push the true total above what the label's caffeine line suggests.
Health groups advise that children and teens skip energy drinks entirely, and mixing them with alcohol is genuinely risky — the caffeine masks how intoxicated you feel without lowering how intoxicated you are. If you do reach for one: read the actual caffeine number, notice the sugar, and mind the stack — an energy drink on top of coffee and pre-workout adds up fast.