When it comes to the healthiest energy drinks, it's important to ensure ingredients are from organic sources with little to no artificial preservatives or ingredients. Caffeine is a primary ingredient in many of these drinks, so if you have a low tolerance for stimulants, energy drinks may not be the best option for you. You should also be wary of the sugar content on the label, as energy drinks tend to be higher in sugar. That said, there are zero sugar options available.