Question: how many mg of caffeine in a rockstar?
Answer: Rockstar products in the US have two levels of Caffeine content - either 10 mg of caffeine per ounce, or 15 mg of caffeine per ounce. Rockstar Energy Drink Original contains 160 mg of caffeine per 16 ounce can, while the Rockstar Punched energy drink contain 240 mg of caffeine per 16 ounce can.