Dietary Supplement. No Time Limits STS Vivadrein™ is a cutting-edge energy boosting formula for activities that last more than an hour. The combination of taurine, yerba mate, guarana and green tea is formulated with the objective to boost energy without the crash associated with most caffeine products. Vivadrein™ tablets are designed with the goal of releasing approximately 50 percent of their caffeine in the first hour and then gradually release the rest for lasting energy. Supplement Training Systems *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.