8 Hour Powder is a fantastic energy drink. Packed with the best ingredients for the best price. This energy drink is sure to give you the extra boost you need to get through the longest days. 8 Hour - Energy Powder has 166 mg of caffeine per serving, plus power energy boosters like Vitamins B3, B6, and B12. Unlike other energy drinks that give you jitters followed by sudden crashes, we have formulated 8 Hour with Taurine and tyrosine to offset those burdensome side effects.