Protein2o, a low-calorie protein beverage water, is launching Protein2o Plus Energy, which boasts 125 milligrams of caffeine in addition to 15 grams of protein. Like all of the brand’s products, Protein2o Plus Energy is made with 100% whey protein isolate and natural flavors and is preservative, gluten and lactose-free; the caffeine it contains is derived from green coffee beans. Protein2o Plus Energy is available in two flavors, Blueberry-Raspberry and Cherry Lemonade. It has only 70 calories per 16.9-ounce bottle. Both flavors will begin to appear on grocery, convenience and drug store shelves starting in February.