Some of the 'mother' strains of the bacteria we use in our Multibiotic product were originally isolated from milk many decades ago. However, representatives of these original strains are stored in microbiology banks and merely used as DNA templates. New colonies of these 'banked' strains are then cultured (fermented) under laboratory conditions. No milk or animal products are used in the fermentation or any other process. Our Multibiotic product is certified Vegan by The Vegetarian Society.