It's not so black-and-white as to say the caffeine content in Bang Energy Drinks is safe or unsafe. As it's coming close to the recommended daily max of 400 mg daily, it could have negative effects on the body - particularly if you have a low caffeine tolerance. It's probably not healthy to consume more than 1 or 2 cans, per week, for most people. However, if you have a high caffeine tolerance, a can per day may not have much of a negative impact on you.