What are Lactobacilli?

Any of a number of species of bacteria that is capable of transforming lactose (milk sugar) into lactic acid through fermentation. Lactobacilli are naturally present in the colon and are sometimes referred to as “friendly” bacteria because they aid in digestion and fight certain disease-causing micro-organisms. The two species lactobacilli most commonly available in supplement form are L. acidophilus and L. bifidus.