Cardiovascular responses to ENERGY drinks in a healthy population during eXercise: The C-Energy-X Study

Energy drinks, the fastest growing beverage market in the United States, contain added caffeine, herbal supplements, amino acids, vitamins, and sweeteners. Energy drinks can be labeled as dietary supplements and therefore do not require premarket approval [1]. Each manufacturer of these beverages has their own proprietary blend of additives which are listed on the label, but volumes or percentages of each are not except for added caffeine. Manufacturers of energy drinks are not required to list the caffeine content from added supplements, therefore the actual amount of caffeine in a single serving is likely to be much higher than the actual amount listed on the label and potentially could cause caffeine toxicity including cardiac burden.
Source: Journal of Electrocardiology - Category: Cardiology Authors: Source Type: research