Source Naturals Life Flora(TM) is an advanced and potent microflora product. It contains acidophilus, Streptococcus thermophilus, Lactobacillus paracasei, and two complementary forms of bifidus. "Friendly" microflora support colon health by altering the intestinal ecology to favor "friendly" flora. Acidophilus also manufactures some B-vitamins, especially folic acid.