Probiotic Extra Strength DF 52 Billion CFU contains 9 species of microorganisms from non-dairy sources. Because each strain has an affinity for a different part of the digestive tract, and a unique mechanism of action.
 
Oral supplements of live, beneficial intestinal microorganisms for nutritional health and well-being are known as probiotics. Bacteria are continually in competition for colonization space. Therefore, the composition of the intestinal microflora is dynamic and constantly changing. If harmful microorganisms proliferate, the equilibrium is disturbed, and it becomes difficult even for indigenous bacteria to maintain their necessary territory to colonize the intestine. Antibiotics tend to kill off both beneficial and harmful bacteria, and thus may also disturb the normal, healthy balance of intestinal microorganisms. Various intestinal conditions can compromise the immune system and lower the amounts of healthy intestinal microflora. When potent probiotic supplements are supplied regularly, chances are greatly increased for establishing and maintaining a healthy population of beneficial intestinal microorganisms. Besides the 9 different strains of microorganisms, Probiotic Extra Strength DF also contains added fructooligosaccharides (FOS) a soluble fiber and prebiotic that selectively supports the proliferation of intestinal probiotics for digestive tract health. Probiotic Extra Strength DF can be a valuable means of increasing normal gut flora in individuals who are lactose intolerant and can be helpful in normalizing digestion, supporting regularity, and gastrointestinal and neurological support. The unique Probiotic Extra Strength DF formula features the following microorganism species:
 Lactobacilli (L.acidophilus, L.rhamnosus, L.casei, L. salivarius) are located in the small intestine and produce lactic acid. Many strains of bacteria from the Lactobacillus family have been shown to support regularity, urogenital and vaginal health, production of the lactase enzymes and protect the gut lining from unwanted materials.
 Bifidobacteria (B. lactis, B. breve, B. longum, B. bifidum) are located in the colon and produce lactic and acetic acids, making the gut a very inhospitable place for unwanted materials.  Bifidobacteria have been shown to promote regularity, even while traveling abroad.
 Streptococcus thermophilus is also a lactic acid producer which lines the gut wall to provide a barrier from unwanted materials, promotes regularity and produces the lactase enzyme.
 Fructooligosaccharides (FOS) are considered a soluble fiber and pre-biotic, which supports the growth of beneficial microorganisms in the intestinal tract. FOS, as a fiber, increases the bulk in the gut to promote regularity.