How long does Bang Energy
stay in your system?

A 16 oz Bang Energy contains about 300 mg of caffeine, one of the highest amounts in any mainstream canned drink, three-quarters of the FDA's 400 mg suggested daily ceiling in a single can. A second can in the same day would push most adults past that guidance.

From 300 mg, the 5-hour half-life leaves about 150 mg after five hours, 75 mg after ten, and roughly 38 mg after fifteen. A can in the early afternoon can therefore still be clearly active well into the night.