is a gram-positive, anaerobic lactic acid bacterium that is a normal inhabitant of the human gastrointestinal tract. B. breve has a history of safe use in foods since 1980. B. breve is a common inhabitant of the human intestine, particularly in infants.

is a gram-positive anaerobic rod-shaped bacterium. B. lactis species is one of the dominant microbiota of human gastrointestinal tract.

is a gram-positive anaerobic rod-shaped bacterium. B. lactis species is one of the dominant microbiota of human gastrointestinal tract

is a non-pathogenic, non-toxigenic, Gram-positive, anaerobic lactic acid bacterium that is a normal inhabitant of the human gastrointestinal tract. L. acidophilus has a history of safe use in fermented foods and probiotics since 1950.

is a non-pathogenic, non-toxigenic, non-spore-forming gram-positive lactic acid bacterium with a long history of use in food production since 1930.

is a gram-positive, anaerobic lactic acid bacterium that has a history of safe use in food since 1970. L. paracasei is a common inhabitant of the human gastrointestinal tract.

is a gram-positive anaerobic lactic acid bacterium that is a normal inhabitant of plant material and has a history of safe use in food since 1965. L. plantarum is a common inhabitant of the human intestine, in both infants and adults.

is a gram-positive, anaerobic lactic acid bacterium, which is a principal component of the natural flora of several food types and has a long history of safe use.