The human intestinal tract contains trillions of beneficial bacteria (a.k.a. probiotics) that provide a multitude of health benefits. But certain circumstances can disrupt this natural balance, such as traveling, or being under high or prolonged stress. Enter Natural Factors Acidophilus & Bifidus. This double strength formula has been blended with goats’ milk to provide an excellent environment to grow beneficial microflora (a.k.a. probiotics), helping to maintain normal intestinal health.*