Probiotics Overview

Loosely defined, probiotics are ingested microbes that can modify intestinal microbial populations in a way that benefit the host. Many of the benefits of supplemental microflora, including Bifidobacteria and Lactobacilli, are well known. These benefits include maintenance of intestinal homeostasis, competitive exclusion of pathogens, production of antimicrobial compounds, promotion of the intestinal barrier function, immune modulation and some very promising results in the area of inflammatory bowel disease.1

There are more than 400 different species of microbes in the intestinal tract. These lactic acid-producing bacteria provide many benefits, including:

  • Synthesizing vitamins and increasing the bioavailability of minerals.5
  • Maintaining the mucosal barrier.6 Reduces untoward symptoms of Irritable Bowel Syndrome.7
  • Inhibiting bacterial pathogens by producing lactic acid, hydrogen peroxide and antibacterial substances called bacteriocins.8,9
  • Stimulating immune function,10,11,12 and modulating immune system hypersensitivity.13
  • Inhibiting Candida albicans.14

Probiotic bacteria colonize primarily the human colon15, produce lactic acid and work to block bacterial infection in the gut by producing antimicrobial substances that are effective against many harmful gram-positive and gram-negative bacteria.16,17 Further, many species of Lactobacilli and Bifidobacteria bind to the intestinal mucosa and prevent attachment of pathogenic coliform bacteria.18,19,20

Probiotics and the Immune System

It is important to note that intestinal immune tissue constitutes nearly 80% of all the immunologically active cells in the body. Research demonstrates an important relationship between microflora and the intestinal immune system. The most dramatic demonstration of the immune stimulating properties of probiotics is in studies on animals raised in a “germ-free” environment (gnotobiotic environment). In these animals, the intestinal immune system is underdeveloped, but is rapidly restored to a normal state upon the introduction of even a single bacterial species.21

Surprisingly, despite the presence of many potential pathogens in the intestinal microflora mix, humans rarely get infected. Research is beginning to clarify why. We now know that the intestine interacts with intestinal bacteria to develop several protective mechanisms. These include two major areas: (1) improving the intestinal barrier function, which is a combination of a mucus layer and the intestinal epithelial cells themselves and (2) stimulating immune function while avoiding exaggerated responses via immune modulation. This interaction between the human host and probiotic microflora is believed to explain some of the clinical benefits, such as treatment and prevention of diarrhea, reducing the risk of necrotizing enterocolitis and modulating host immune response (such as in allergic disease).22

In a study with healthy adult volunteers, immune response connected with supplemental Lactobacillus acidophilus and Bifidobacterium lactis was clearly demonstrated. L. acidophilus and B. lactis demonstrated significant cellular immune response indicated by increased phagocytic activity of granulocytes and monocytes. The activity of these white blood cells were significantly elevated from 92 to 95% during the probiotic phase of the study.23

Multiple organ dysfunction syndrome (MODS) is a major cause of mortality in intensive care units. Most often this results from an abdominal infection from mildly pathogenic organisms like coagulase-negative Staphylococcus, Enterococcus, and Candida species, among others. A breakdown in the intestinal barrier function and immune dysfunction is directly related to the onset of MODS. Probiotic bacteria have been shown to modulate intestinal barrier and immune function. In a recent study, ICU patients responded to probiotics with a significantly larger increase in systemic Immunoglobulins (IgA and IgG) concentrations than in the patients who did not receive probiotics. The authors’ conclusion: patients receiving probiotics show a greater enhancement in immune activity than patients who do not receive probiotics.24

The effect of Lactobacillus casei immunomodulatory activity on inflammation and coagulation during pneumococcal pneumonia was investigated. Supplemental L. casei accelerated the rate of recovery of defense mechanisms against pneumococci by inducing different cytokine profiles. These cytokines were involved in the improvement of the immune response and in the induction of a more efficient regulation of the inflammatory process, limiting the injury caused.25

Macrophages are an important cellular component of the immune system. They are active phagocytic cells and part of the reticuloendothelial system. They are an important part of the body’s antiviral response, actively destroying infected cells. Probiotics play an important role in supporting a balanced immune system in part by stimulating the phagocytic activity in macrophages. In a recent in vitro study, both Lactobacillus and Bifidobacteria species were able to decrease viral infections by stimulating an antiviral response in macrophages in cells infected with vesicular stomatitis virus (VSV).26

One of the most effective probiotic species is the spore-forming bacteria Lactobacillus sporogenes (also called Bacillus coagulans). The spore protects the bacteria in the acid environment of the stomach providing a much higher survival rate compared to non-spore forming bacteria. In the alkaline environment of the small intestine, the active, live bacteria emerge from the spore. Not only does it produce lactic acid, it has been shown to have significant antioxidant and free radical scavenging activity.27,28

There are still many questions about how probiotics modulate and stimulate the immune system. Yet, it is clear there is a very real response in support of the immune system by these friendly microflora. No doubt research will continue to elucidate the how and why of their actions. In the meantime, all of us can benefit from supplementation with probiotics, regardless of age or gender.

Probiotics and Allergic Disorders

Common allergy symptoms generally begin in infancy. It turns out that a baby’s immune response to the environment is generally more typical of allergic disease. Today, allergic disease is on the rise in developed countries and has led to the so called “hygiene hypothesis”29,30. In essence, this hypothesis bases the increase in allergic disease to increased hygiene, which reduces exposure to microbial stimuli. The result of this is rather than developing a tolerance to antigens, the tendency is for a greater allergic type response31,32. Research seems to demonstrate that colonization of friendly flora in the intestine of infants is an important factor in the development of a tolerance to environmental antigens, which in turn prevents or at least reduces allergic diseases in children. A 2001 study demonstrated a significant reduction in the frequency of atopic dermatitis when babies either received a Lactobacillus supplement or nursed with mothers that took thesupplement.33 The immunological basis for this phenomenon is yet to be determined. Still, it is apparent that probiotic supplementation has an important effect on intestinal immune system development in infants. Clinical trials have shown that symptoms of atopic eczema in infants can be significantly improved through the addition of Lactobacilli or Bifidobacterium species.34

Allergic disorders may be considered aberrant barrier functions of the skin and intestinal mucosa and the result of over stimulation of the immune response to environmental antigens. The current approach to treatment  include strengthening the gut barrier function and modulation of abnormal immune responsiveness. Lactobacilli and/or Bifidobacteria aid in the degradation or modification of enteral antigens, regulation of inflammatory mediators and a modulation of an over-active immune response when the risk of allergic disease is heightened.35

Modulation of commensal bacteria of the gut with probiotics has been shown to moderate the immune system and to have an effect on both the prevention and treatment of food allergy.36

Early dietary intervention with oligosaccharide prebiotics has a protective effect against both allergic manifestations and infections. The observed dual protection lasting beyond the intervention period suggests that an immune modulating effect through the intestinal flora modification may be the principal mechanism of action.37,38

Probiotics and Genitourinary Candidiasis

World wide, yeast and bacterial vaginitis affect nearly a billion women annually. Currently, antibiotics are the main therapeutic agents used in treatment. Yet, recurrence of infection, side effects and secondary infections are common. The disruption of native vaginal bacteria, primarily lactobacilli, after antibiotic therapy, leaves the vagina susceptible to overgrowth of yeast as well as bacterial vaginosis. There is growing evidence from in vitro and human data to suggest that certain lactogenic bacteria may provide health benefits for a large number of women.39

While antibiotic therapy is generally effective at treating the initial infection, the repeated use of these antimicrobial agents upon recurrence contributes to an increasing development of microbial resistance. It is clear that intestinal and urogenital microflora play a central role in maintaining the health and well-being of humans. Therefore, the use of supplemental probiotics to replace or augment natural bacterial populations is gradually achieving acceptance.40,41

Lactobacilli have long been considered the protective flora in the vagina that displace and kill vaginal pathogens. Lactic acid, H2O2, and antibacterial agents called bacteriocins are believed to be the source of the anti-bacterial and anti-candidal activity of lactogenic bacteria. Two of the identified bacteriocins are lactocin and bacitracin, though there are others. A study with Lactobacillus sporogenes was shown to be effective in a variety of vaginal diseases. The organisms were viable and exhibited the production of lactic acid, hydrogen peroxide and demonstrated antagonistic activity against the uropathogens.42

In vitro studies have shown that lactobacilli can inhibit the growth of Candida albicans and/or its adherence on the vaginal epithelium. The results of a clinical trial support the effectiveness of lactobacilli, especially Lactobacillus acidophilus and Lactobacillus rhamnosus, administered either orally or intravaginally in colonizing the vagina and/or preventing the colonization and infection of the vagina by Candida albicans.43

The question arises as to what actually produces the anti-yeast activity in lactogenic bacteria. A study was conducted comparing the anti-candidal activity of live active cultures of various Lactobacillus strains against the actual chemical compounds of pure H2O2 and lactic acid. Interestingly, the cultures demonstrated significantly greater activity than the pure chemical compounds. This supports the concept that mixtures of Lactobacillus strains provide many different metabolites and that there are other factors beyond hydrogen peroxide and lactic acid producing anti-candidal activity. No doubt the bacteriocins and possibly other factors contribute to the anti-candidal activity of the Lactobacillus strains.44

Lactobacillus strains with known antagonistic properties against bacteria were tested for their adhesion to vaginal cell lines in vitro and their antagonistic activities against Candida. Their anti-candidal activity was related to hydrogen peroxide (H2O2) production in some strains, but even in the presence of catalase treatment that suppress H2O2, anti-candidal activity continued, suggesting alternative mechanisms.45

Another in vitro study with the probiotic Lactobacillus plantarum investigates whether this organism had any effects upon the Candida populations. Although C. albicans was not completely eradicated in the presence of this bacterium, cell counts were markedly reduced, indicating a compromised physiological function. This study shows that normal gut flora can exert limiting effect on C. albicans. Unfortunately, this effect appears to be diminished during antibiotic intake. The authors conclude the use of probiotics can help fortify natural resistance.46

There are numerous studies demonstrating the direct application of Lactobacillus directly into the vaginal canal to both suppress C. albicans and to maintain normal balance of microflora.47,48,49 Still, there is substantial evidence to support the case for oral lactogenic bacteria to accomplish the same. What does seem to be clear from the literature is that a combination of different lactogenic bacterial will provide the greatest results. This is due to the fact that not all lactogenic bacteria produce H2O2, though most do. It is clear that other properties contribute to the over all anti-candidal activity, including lactic acid and a variety of bacteriocins as well as other currently unknown factors.


There are many citations of the resolution of diarrhea utilizing probiotics. This is well known. A more interesting issue is whether probiotics can prevent diarrhea while taking antibiotics. Previously, It was commonly thought Lactobacilli and Bifidobacteria supplements were not effective if taken during antibiotic therapy. Recent research supports the use of probiotics during antibiotic administration.50,51 In fact, L. acidophilus has been shown to correct the increase of gram-negative bacteria that commonly occurs following the use of broad-spectrum antibiotics given when treating acute or chronic diarrhea.52,53,54 Furthermore, reductions of friendly bacteria and/or advanced infection with antibiotic-resistant bacteria may be prevented by using L. acidophilus and antibiotics concurrently (a dosage of 15 to 20 billion probiotic organisms is recommended).55

Inhibition of Pathogenic Bacteria

A double blind study examining the effect of  L. acidophilus and L. casei on small intestinal bacterial overgrowth, researchers found a significant decrease as early as one week into treatment.56 At least part of the action is believed to be the result of substances produced by probiotics called bacteriocins. These compounds act as natural antibiotics to kill undesirable microorganisms.57

Additional Lactobacillus species include L. brevis, which may increase the production of IFN-alpha;58 L. bulgaricus, which helps reduce cholesterol levels59,60 and can inhibit the growth of H. pylori;61 and L. plantarum, which can reduce the severity of chemotherapy-induced enterocolitis62 and inhibit attachment of E. coli bacterium to human colon cells.63

Irritable Bowel Syndrome and Other GI Disorders

Recent research in Irritable Bowel Syndrome has proven to be very positive. Lactobacillus. plantarum has been shown to reduce abdominal pain and flatulence in patients with irritable bowel syndrome (IBS) and may help prevent traveler’s diarrhea.64,65 Lactobacillus casei has also shown very positive results in IBS.1

The Bifidobacteria also offer a host of benefits, particularly with GI diseases and diarrhea. When used as an adjunct to treatment with medication, a combination of B. brevis, B. bifidum and L. acidophilus was shown to help prevent relapse and reduce symptoms in patients with ulcerative colitis.66,67 And some research indicates that taking B. longum can reduce stool frequency, abdominal discomfort, and stool clostridial spore count in antibiotic-associated diarrhea;68

Effective Supplementation

Oral supplementation of common Lactobacilli and Bifidobacteria species have a good safety profile and are well tolerated, as evidenced throughout studies in which they were used up to one year and longer. There are no known drug interactions with these probiotic species.69,70

For additional health benefits, probiotic products are best when combined with “prebiotics,” such as fructooligosaccharides (FOS), galactooligosaccharides and inulin. When probiotics are combined with prebiotics, the resulting supplement is called a synbiotic. Prebiotics promote the growth and activity of probiotic bacteria.71,72,73 FOS particularly may even help relieve constipation by increasing fecal mass.67

Clearly, given the many benefits of the various probiotic species, it makes perfect sense to provide a comprehensive blend of many different species that will then provide the best attributes of each in a single probiotic supplement. In terms of daily dosage, at least 10 billion colony forming units (CFU) is recommended,74 although 14 to 20 billion CFU may be more desirable.

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