bodynutrition.org › caffeine-pillsRanking the best caffeine pills of 2021 - Body Nutrition Aug 03, 2020 · A: Caffeine pills get a bad rap because it’s quite easy to overdo it: the relatively long delay (60-90 minutes) between taking a pill and experiencing its full effect, and the high dosage per pill that’s common in many over the counter caffeine pills, makes it easy to blow past the optimal dose and get jitters and anxiety.