Looking at the ingredients, this is a horrible drink... Drinking anything out of aluminum is not a good idea. Sugar free Redbull is made with synthetic carbonation, which causes radicals and free radicals, resulting in mineral and oxygen deficiencies. Naturally carbonated water helps with oxygen absorption and replenishes electrolites and helps relax adrenal glands. Sugar free Redbull also has aspartame which is horrible for you. You would be much better off with some pre workout and naturally carbonated water.