Sugar is the only thing standing in the way of Red Bull being a perfect drink - sugar free drinks are often even worse than sugared drinks health wise, but Erythritol is a fantastic replacement, and it causes a pleasant cooling sensation which would be perfect for a winter edition or a summer cooler. Prebiotic erythritol is gaining traction as a great sugar replacement, and bonus it can be naturally obtained from monk fruit. The health foods market is just waiting for an energy drink without the negative stigma of sugar and artificial sweeteners - Red Bull, monk fruit edition could be that beverage.