Both these formulas contain caffeine and we do not recommend taking them together. The energy drinks are useful for refreshing energy on-the-go, while the shots work well for a convenient quick way to boost energy. The FDA has advised that up to 400 mg caffeine per day is not generally associated with negative effects in healthy adults, but always consult with your healthcare provider first. PS: Don’t forget to take into account other sources of caffeine in your diet as well. ​