ZIR-FOS contains Bifidobacterium (Bifidobacterium longum BB536), 5 billion CFU per sachet), Fructooligosaccharides Actilight and Vitamins from the BO Complex Bifidobacterium longum BB536 is one of the main components of the bacterial flora existing in the human intestine. Different factors such as the use of antibiotics, stress, poor digestion or an unbalanced diet can change the normal balance of the intestinal flora and lead to gastrointestinal disorders. In these cases, the use of Bifidobacterium longum BB536 balances the intestinal flora. Actilight short-chain fructooligosaccharides (FOS-Actilight) are carbohydrates that pass through the stomach and small intestine without being digested or absorbed. When they reach the colon, they become the specific nutrient for Bifidobacteria, stimulating their growth. The vitamin component is made up of the B-complex vitamins (B1, B2, B6 and B12) at 100% of the VRN (nutrient reference values), that participate in normal energy-producing metabolism. Additionally, vitamins B6 and B12 contribute to the normal functioning of the immune system.