Simply natural is a pure unsweetened version of spiru tein the worlds greatest energizing protein shake with only 5 g of carbs and 80 calories per serving spiru tein simply natural is a creamy and delicious treat for both low carb and low calorie diets spiru tein energy shakes now feature our pioneering patent pending tri part protein blend of non gmo rice protein pea protein and both non fermented and fermented soy with 14 grams of protein each serving of spiru tein is a high protein