Simply Natural SPIRU-TEIN Shake Product No. 45881 Even if you already have a favorite SPIRU-TEIN flavor, you might have a desire to create your own flavor, or flavor combo. That's precisely why we decided to develop a simple, unsweetened SPIRU-TEIN so consumers can use their own taste imagination and create the SPIRU-TEIN they really want! The possibilities are endless! Add fruit, nuts, cereals, anything healthy and natural! Simply Natural has all of the vitamins, minerals, soy protein and special nutrients that make the SPIRU-TEIN formula unique. Each serving of SPIRU-TEIN is a high protein energy meal, providing 14 grams of the finest isolated soy protein available. provide a broad range of minerals and an incredible 100% of the Daily Value of all vitamins.