(TrendHunter.com) C4 Smart Energy Natural Zero is a new performance energy drink that's powered by plants and free from sugar, calories, artificial sweeteners and flavors. The canned beverage is a plant-based... (TrendHunter.com) C4 Smart Energy Natural Zero is a new performance energy drink that's powered by plants and free from sugar, calories, artificial sweeteners and flavors. The canned beverage is a plant-based...