ClearFast is an all-natural, clear, carb-rich drink made for patients who are fasting before surgeries and colonoscopies. ClearFast is used every day in hundreds of the Nation’s top hospitals to ease the fasting process. One bottle of ClearFast the night before surgery, and a second bottle finished 2 hours before surgery will hydrate and nourish your body so you can recover faster while reducing infection risk and post-op nausea!