Mine say (up to) 32mg caffeine per pill, same brand and product. weird. but you need to assess your tolerance for 1 pill, 2 pills, 3 pills so on and so forth. once you start seeing negative side effects after a few days at that dosage, you know you went too high and need to back it down to the previous level where you were OK with it. I know I stay away from stims, and I was taking 2 of these per day (64mg) and 2-3 zero cokes per day (about 100 and change mg) and I seemed fine.