A group of lactic acid producing microorganisms that constitute a numerically major part of the gastrointestinal microflora in humans.

or bifidus, are one of the numerous beneficial or "friendly" bacteria that reside in the intestinal tract and help fight off infection. Considered a "probiotic" it is a lactic acid bacteria that aids in the digestion of the natural sugars in milk.

Bifidobacteria (1) consume old fecal matter; (2) have the ability to remove cancer-forming elements, or the enzymes which lead to their formation; (3) protect against the formation of liver, colon, and mammary gland tumors.