CELSIUS. Live Fit. A uniquely blended formula with healthy energy and key vitamins make CELSIUS an ideal pre-workout drink. Not only is this line of CELSIUS naturally caffeinated, but it's also naturally sweetened with a blend of Stevia and Erythritol. Each flavor is low in sodium and contains zero sugar, no aspartame, and no artificial flavors, colors, or preservatives. CELSIUS energy drinks are also Certified Vegan, Kosher, and non-GMO. Its proprietary formula contains green tea extract and EGCG. It also includes guarana seed extract and green coffee bean extract as natural sources of caffeine, ginger root for flavor and digestion, vitamin C to support your immune system, vitamin B for energy production, and chromium to help control hunger.