Probiotic-10 50 Billion from NOW Foods is designed to provide a high potency and balanced spectrum of beneficial bacteria found in human intestinal tracts. Regular intake of beneficial probiotics can aid in maintaining healthy intestinal flora. This product also contains fructooligosaccharides (FOS) to assist in healthy growth of acidophilus and bifidus organisms. Contains no salt, starch, wheat, gluten, soy, milk, egg, shellfish or preservatives.