* New! * Diet * Energy * No Time Limits * Dietary Supplement 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.