Gluten Free. Naturally Sweetened. Kill Cliff was developed by a former U.S. Navy Seal as an athletic performance product. It can improve endurance and speed recovery. Kill Cliff is made from the highest quality ingredients available and may help you perform at a higher level for a prolonged period of time. Kill Cliff is low calorie and lightly caffeinated, with a natural blood-orange flavor. Kill Cliff is a refreshing alternative product and it tastes great. A portion of the proceeds from every case sold is donated to Navy Seals and special operations related charities.