HealthAid Acidophilus Plus 4 Billion capsules are formulated using special strains of Probiotic cultures on a dairy free medium. Fructo-Oligosaccharides (FOS) are added to help support the growth and proliferation of bacterial strains in the intestinal tract. HealthAid Acidophilus Plus 4 Billion helps support a balanced intestinal flora, to maintain good digestion and support healthy immune function. Helps to improve absorption and assimilation of nutrients in the body. Promotes healthy intestinal flora. Support for the digestive system.