Engineered for extreme and intense training, AllMax Nutrition VitaStack is the best multivitamin supplement for a sensitive stomach. The product comes in an ideal 9-pill, 7-function, easy-to-take pack. The formula contains 70 highly active ingredients that will increase your muscle mass, optimize your energy levels, support joint health, provide mental focus and improve your overall heart health. These multivitamins also contain anabolic nutrient optimizers, enhancing the absorption of nutrients and supporting the natural digestion system.