Another systematic review of the literature evaluating efficacy of probiotics in the treatment of IBS revealed that probiotics had a statistically significant effect in reducing IBS symptoms with a number needed to treat (NNT) of 4 (95% CI 3–12.5) [Moayyedi et al. 2010]. Almost all probiotic combinations contained both Bifidobacteria and Lactobacilli; the latter had no effect as assessed by continuous data meta-analysis. This raises the possibility that Bifidobacter may be the active treatment in probiotic combinations.
Look, it makes sense that the gut would be ground zero for easing all kinds of ailments. In the past decade, scientists have discovered that the three pounds of microbes inside the digestive system—some 40 trillion bacteria, fungi, and viruses collectively known as the microbiota—aren't squatters mooching off a nutrient-rich environment. They're like a living organ unto themselves, working with the body to lap up nutrients from food, squeeze out germy invaders, and calibrate our immune systems. And since changes in the microbiota have been linked to gastrointestinal conditions like irritable bowel syndrome, adding "good" bacteria in the form of probiotics should boost your health.
Probiotics: Health benefits, facts, and research Every human on the planet has microbes living in their body. While bacteria get a bad reputation, many can promote good health. Probiotics are a type of 'good bacteria' that provide health benefits for the host. The health benefits of probiotics include treatment of diarrhea and irritable bowel syndrome. Read now
I didn’t know there was much of a difference between probiotics until I did some research. After realizing the ones I had been getting were probably not doing anything for me, I wanted to invest in a better option. This brand checked all the boxes and was still really affordable! I’ve been taking them for about a week now and I can tell a difference! The first few days I didn’t feel too great but realized it was because this probiotic was actually doing something for me and rebalancing my gut. Now I feel less bloated and all around healthier. I will definitely be getting more!

No matter how many superfoods you eat, your body won’t be able to benefit from them if your gut environment isn’t teeming with healthy bacteria. You see, enzymes and digestive bacteria help to break down the food you eat into molecules that make their way into your bloodstream to nourish your body. Inadequate or unbalanced microbial populations in the gut can derail this process and can even lead to malabsorption of critical nutrients. 

Hardly a day goes by without some new announcement related to the beneficial effects of probiotics for women’s health. We have now gotten to a place where the notion of doing everything you can to maintain and reinforce healthy gut bacteria has become well defined as an important recommendation from healthcare providers across a wide spectrum of specialties. Who would’ve thought that maintaining healthy gut bacteria would be an important consideration in such seemingly diverse specialties as gastroenterology, gynecology and even psychiatry?
The National Yogurt Association, who created this seal of approval, requires all yogurt manufacturers to include it on products that meet the standard of having a sufficient number of probiotics. The probiotics in store-bought yogurt need to meet this standard in order to be shelf-stable and reach your body alive. But even then, this standard isn’t all that useful in practice. The number just refers to the total number of live cultures and not the levels for each of those microbes. It’s possible, Taub-Dix says, that a product won’t have high enough levels of a certain probiotic to have any effect.
Probiotics are a big and rapidly growing business and are now among the most popular dietary supplements. The term probiotic refers to dietary supplements (tablets, capsules, powders, lozenges and gums) and foods (such as yogurt and other fermented products) that contain “beneficial” or “friendly” bacteria. The organisms themselves are also called probiotics.
Thank you for your query. We asked dietitian Emer Delaney to respond to your questions and this is what she said, "My article lists a number of different evidence-based articles which I've listed below:,,,, and The study I believe you're referring to was looking at the use of probiotics in healthy people. My article and the supporting evidence includes people with specific medical conditions such as IBS, people who are in hospital and those suffering from diarrhoea from antibiotics i.e. not the healthy population. In addition, the article states the trials were still highly variable in their methods and design - the type of probiotics given and how gut bacteria were assessed were different, therefore affecting the quality of the data. The studies also contained many quality limitations as the participants were not blinded which can significantly affect results. Only one study looked at the number needed to treat, which again can result in poor outcomes and statistical assessment was lacking in many of the studies. Finally, none of the trials were from the UK, so the formulations used may differ from those on the UK market. All of the above results in a very weak conclusion." We hope this helps to allay your concerns.
Many studies have shown that probiotics reduce diarrhea associated with taking antibiotics in both adults and children. In fact, it is common for physicians and pharmacists to recommend eating a probiotic-fortified yogurt every day during a course of antibiotics to prevent diarrhea. More research is needed to determine which probiotics are associated with the greatest effect for specific antibiotics.
There is only preliminary evidence for most probiotic health claims. Even for the most studied probiotic strains, few have been sufficiently developed in basic and clinical research to warrant approval for health claim status by a regulatory agency such as the Food and Drug Administration or European Food Safety Authority, and, as of 2010, no claims had been approved by those two agencies.[3] Some experts are skeptical about the efficacy of different probiotic strains and believe that not all subjects benefit from probiotics.[3][112]
When I polled friends and family about their personal experiences with probiotics, I got a real mixed bag of responses. Some called them a lifesaver and others felt no effects whatsoever. I put the anecdotes aside and talked to Ben Lebwohl, gastroenterologist and director of clinical research at Columbia University’s Celiac Disease Center, to get the straight poop on whether probiotics are miracle or myth.

Probiotics have been used therapeutically for many centuries in different parts of the world for their contribution to longevity and digestive health. The World Health Organization has defined probiotics as ‘live organisms which when administered in adequate amounts confer a health benefit on the host’. Categories of probiotics in use today include: bacteria such as lactic-acid bacteria (LAB) and Escherichia coli strains (such as E. coli Nissle 1917), as well as yeast species including most prominently Saccharomyces boulardii among others (Table 1). Prebiotics such as lactulose, inulin, psyllium, and other oligosaccharides (found in onions, garlic, asparagus, leeks, artichoke, bananas, tomatoes, wheat, oats, soy beans, and other plants) are nondigestible food ingredients that stimulate the growth or activity of bacteria in the GI tract which are beneficial to the health of the body [Grajek et al. 2005]. Synbiotics are a combination of a prebiotic and a probiotic, such as inulin and Lactobacillus rhamnosus GG or Bifidobacter longum. Antibiotics, in contrast, are compounds that kill or inhibit the growth of bacteria.
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Every day, we’re exposed to toxins and inflammation-causing molecules from food and the environment that negatively impact digestion through pathways, such as leaky gut, known in the medical field as intestinal hyperpermeability. In leaky gut, the tight junctions that are supposed to keep disease-contributing compounds from leaving the digestive system are disrupted, allowing a lot of things through into the bloodstream that don’t belong there.
The bottom line: Keeping your gut microbiome balanced is vital for maintaining healthy digestion, promoting sleep and immune strength, and more – and natural approaches are the best way to achieve that balance, says Dr. Rawls. Feel free to give probiotic supplements a try if you like, but be sure to track your progress to make sure it’s worth the money. And know that supplementing with the right herbs and botanicals, along with eating plenty of natural sources of both prebiotics and probiotics, will likely deliver the results you seek much more quickly.
Digestive problems. The best evidence for probiotics is for reducing diarrhea, especially following antibiotic use. A 2010 review from the Cochrane Collaboration concluded that probiotics shorten episodes of acute infectious diarrhea. And in 2011, a Health Canada monograph stated that products containing certain probiotics (such as Lactobacillus rhamnosus GG) help manage acute infectious diarrhea and antibiotic-associated diarrhea. A 2012 research review in the Journal of the American Medical Association (JAMA) found that probiotics reduced the risk of antibiotic-associated diarrhea by 42 percent—but many of the studies had flaws, so these findings should be interpreted with caution. A 2013 Cochrane review of 23 trials also concluded that probiotics may be effective for preventing antibiotic-related diarrhea. However, two large, well-designed studies, in the Lancet in 2013 and the Annals of Internal Medicine in 2014, found that probiotics were no better than a placebo in preventing diarrhea in older people taking antibiotics. A review of 19 studies, published in Gastroenterology in 2017, found that probiotics reduce the risk of Clostridium difficile-related diarrhea in hospital patients, especially when the supplements were started during the first two days of antibiotic treatment.

In a separate study involving 21 healthy volunteers, also published today in Cell, the same group of researchers found that taking probiotics after treatment with broad spectrum antibiotics may actually delay the return of people's normal gut microbiome. This goes against the idea that probiotics can help "repopulate" people's gut bacteria after antibiotics wipe them out.

Twenty-one volunteers were given a course of antibiotics and then split into three groups. The first group were left to let the microbiome recover without any interventions, the second group were given probiotics and the third were given a fecal transplant of their own gut bacteria which was collected before the antibiotic treatment. The study found that the probiotics easily colonized the gut of the second group, but worryingly, rather than aiding the return of the normal gut microbiome, the probiotics actually significantly delayed it for months compared to both the group that had no intervention and the people who received a transplant of their own gut bacteria.

While Lebwohl isn't comfortable endorsing a specific brand publicly, he did say "a widely used brand in which the compound is bifidobacteria or lactobaccilus seems like a reasonable way to go in a patient who is eager to give this a try, but would be best done under the supervision of a healthcare professional.” He does advise looking for a supplement with between 1 billion and 10 billion colony-forming units, or CFUs.
"Probiotics help with constipation, diarrhea, colitis, irritable bowel syndrome, abdominal pain, Crohn's disease, and flatulence," says Shapiro. "Probiotics work to increase the number of immunoglobulin cells and cytokine-producing cells in the intestine. They improve the healthy bacteria population in the GI tract by repopulating the gut to help with digestion."

SCFA molecules are a subset of fatty acids that are churned out by some types of gut microbes during the fermentation of fiber. They're associated with maintaining gut health and protecting against disease, so a probiotic containing baby-poop microbes could provide health benefits by boosting SCFA production in a compromised digestive system, researchers reported in the new study. [5 Ways Gut Bacteria Affect Your Health]

Non-dairy sources of probiotics include miso, tempeh, kimchi, and sauerkraut. Miso is a savory, nutty paste made from fermented soybeans. It's extremely versatile and a lovely addition to soups, marinades, vegetables, and dressings, like this Miso Citrus Vinaigrette. If you're not familiar with tempeh (aka tofu's counterpart), it is comprised of fermented soybeans that are packed into cakes. Tempeh makes a great alternative to meat in sandwiches, stir-fries, and curries.
Lactobacillus predominantly live in your small bowel (the portion of your gut that follows the stomach). Probiotics containing Lactobacillus sp. help to repopulate the small intestine with friendly organisms that aid in supporting digestion and immune function. The most beneficial are L. acidophilus, L. plantarum, and L. paracasei. One study found Lactobacillus acidophilus could reduce gut inflammation. L. rhamnosus helps increase GABA expression (an inhibitory neurotransmitter that helps you feel relaxed) in the brain, resulting in lower anxiety and depression-related behavior. Another found that a combination of Lactobacillus and Bifidobacteria (which we'll talk about next) improved symptoms of bloating in patients with functional bowel disorders, and yet another found that when people took the Lactobacillus rhamnosus GG strain, it significantly reduced the risk for antibiotic-associated diarrhea.
In the second study, the researchers questioned whether patients should be taking probiotics to counter the effects of antibiotics, as they are often told to do in order to repopulate the gut microbiota after it's cleared by antibiotic treatment. To look at this, 21 volunteers were given a course of antibiotics and then randomly assigned to one of three groups. The first was a "watch-and-wait" group that let their microbiome recover on its own. The second group was administered the same generic probiotics used in the first study. The third group was treated with an autologous fecal microbiome transplant (aFMT) made up of their own bacteria that had been collected before giving them the antibiotic.
In a separate study involving 21 healthy volunteers, also published today in Cell, the same group of researchers found that taking probiotics after treatment with broad spectrum antibiotics may actually delay the return of people's normal gut microbiome. This goes against the idea that probiotics can help "repopulate" people's gut bacteria after antibiotics wipe them out.
Non-dairy sources of probiotics include miso, tempeh, kimchi, and sauerkraut. Miso is a savory, nutty paste made from fermented soybeans. It's extremely versatile and a lovely addition to soups, marinades, vegetables, and dressings, like this Miso Citrus Vinaigrette. If you're not familiar with tempeh (aka tofu's counterpart), it is comprised of fermented soybeans that are packed into cakes. Tempeh makes a great alternative to meat in sandwiches, stir-fries, and curries.
We love that RAW offers proprietary blends for various needs, including specialty formulas for women and men. Both support the standard systems (immune, digestive, etc.), and the women’s probiotic tacks on extras, including L. reuteri and L. rhamnosus, to support vaginal health. The men’s blend adds L .fermentum, to boost immunity during exercise and other physical exertion.
Medications (especially antibiotics), stress, diet and other factors can alter the ratio of good to bad bacteria in your gut, causing infection and disease. This happens more often than you might think: antibiotics are one of the most prescribed medications in Canada and the US (and often prescribed unnecessarily… but that’s another story) (3;4). They’re important and effective in killing infection-causing bacteria, but they often end up killing a lot of good bacteria, upsetting that important balance and giving dangerous Clostridium difficile bacteria a chance to cause severe diarrhea and other bowel diseases, sometimes with fatal results (5).
The trillions of bacteria in your gut play many roles including encouraging proper intestinal permeability (keeping things within your gut that shouldn’t slip out) and keeping out unfavorable bacteria, yeast, and parasites. You’ll always have some bad guys, but you want to keep your gut predominantly filled with good bacteria. To do that, eat plenty of fermented food like unpasteurized sauerkraut, kimchi, and no-sugar-added coconut yogurt. You might also want to supplement with a professional-quality probiotic. Look for dairy-free probiotics that contain at least 15 billion CFUs each of Lactobacillus and Bifidobacterium (a total of 30 billion CFUs) guaranteed by the manufacturer through the expiration date. Take on an empty stomach once or twice a day for at least three months, and keep probiotics refrigerated after opening to maintain their freshness and potency. If you have a leaky gut or inflammatory bowel disease (such as Crohn’s or ulcerative colitis), you may need to take up to a total of 200 billion CFUs daily. For those and other conditions that require very high-dose probiotics, I recommend working with a gut-health specialist.
The large intestine is home to hundreds of trillions of bacteria. Fortunately, most are neutral or even beneficial, performing many vital body functions. For example, they help keep “bad” bacteria at bay, play a role in immunity, help us digest food and absorb nutrients and may even have anticancer effects. But will consuming them as probiotics in foods or capsules make a notable difference to your health—especially if you are already healthy? Here’s a look at the evidence.