Probiotics can help with gastritis, but mainly in one specific role. When taken alongside antibiotic treatment for H. pylori, the most common cause of chronic gastritis, certain probiotics modestly raise the chance that treatment works. They also clearly cut side effects such as diarrhea. The best-studied options are Saccharomyces boulardii, Lactobacillus reuteri and Lactobacillus/Bifidobacterium blends. There’s little good evidence that probiotics alone cure gastritis or clear H. pylori, so think of them as support for treatment, not a replacement.
Many people come to probiotics hoping for a natural fix that avoids antibiotics. I understand that. Antibiotic courses for H. pylori are tough, and resistance is rising. But it’s important to be clear about what probiotics can and can’t do, so you don’t spend months on a supplement while an infection carries on underneath. Below is what the trials actually show, which strains have the best evidence, how to take them, and one caution if you also have reflux.
Key Takeaways
- Most chronic gastritis is caused by H. pylori, which needs antibiotic treatment. Probiotics work best as an add-on to that treatment.
- A meta-analysis of 13 trials found that adding probiotics increased H. pylori eradication by about 15% in relative terms.
- Saccharomyces boulardii raised eradication from 71% to 80% and cut overall treatment side effects by more than half in a meta-analysis of 11 trials.
- Lactobacillus reuteri reduced the H. pylori load and dyspeptic symptoms on its own, but didn’t eradicate the infection.
- Lactobacillus and Bifidobacterium blends roughly doubled the odds of successful eradication in another meta-analysis of 10 trials.
- Probiotics are generally safe but should be avoided or discussed with a doctor if you’re severely immunocompromised or seriously ill.
- Fermented foods like yogurt and kefir contain probiotics but are acidic, which matters if you also have reflux or throat symptoms.
- For gastritis from NSAIDs or alcohol, removing the cause matters far more than any probiotic.
How Probiotics Might Help the Stomach
The stomach is far too acidic for most bacteria, which is partly why H. pylori is so unusual. It survives by burrowing into the mucus layer and neutralizing acid around itself. Some probiotic strains appear to interfere with it in several ways:
- Competing for attachment sites. Some lactobacilli block H. pylori from binding to the receptors it uses to stick to stomach cells.
- Producing antimicrobial substances, such as lactic acid and bacteriocins, that suppress H. pylori growth.
- Calming inflammation in the stomach lining.
- Protecting the rest of the gut from antibiotic side effects, which helps people finish their treatment.
That last effect may be the most important in practice. H. pylori treatment involves two or three antibiotics plus a PPI for 10 to 14 days. Diarrhea, nausea and taste changes are common, and people who stop early are much more likely to fail treatment.
What the Research Shows
Probiotics as an add-on to H. pylori treatment
A meta-analysis of 13 randomized trials (2,306 patients) found that adding probiotics to standard eradication therapy increased the eradication rate (relative risk 1.15). It also reduced overall side effects [Lü et al., PLoS One, 2016].
A separate meta-analysis of 10 trials looked specifically at combined Lactobacillus and Bifidobacterium products. It found about twice the odds of successful eradication (odds ratio 2.07) with probiotics added, plus fewer side effects [Wang et al., Journal of Clinical Gastroenterology, 2013].
Saccharomyces boulardii
S. boulardii is a probiotic yeast rather than a bacterium, so antibiotics don’t kill it. That makes it a logical partner for antibiotic treatment. An updated meta-analysis of 11 trials (2,200 participants) found:
- Eradication of 80% with S. boulardii, compared with 71% without
- Overall treatment side effects reduced by 56% (relative risk 0.44)
- Diarrhea specifically reduced by about half (relative risk 0.51)
[Szajewska et al., Alimentary Pharmacology & Therapeutics, 2015]
The authors rated the evidence as moderate to high quality. On current evidence, it’s the strain I’d look at first if you’re about to start H. pylori treatment.
Lactobacillus reuteri
In a double-blind trial of 40 people with H. pylori, four weeks of L. reuteri alone reduced the bacterial load, measured by breath and stool tests, and reduced dyspeptic symptoms compared with placebo. However, it didn’t clear the infection, and it didn’t change the success rate of the antibiotic treatment that followed [Francavilla et al., Helicobacter, 2008].
This is a good example of the overall picture. Probiotics can turn H. pylori down, and that may ease symptoms, but they rarely switch it off.
What the guidelines say
The Maastricht VI/Florence consensus, the main international guideline on H. pylori, recognizes that certain probiotics can reduce the GI side effects of eradication therapy. It doesn’t recommend probiotics as a treatment on their own [Malfertheiner et al., Gut, 2022].
Probiotics for gastritis without H. pylori
This is where the evidence is thin. There’s little good trial data on probiotics for gastritis caused by NSAIDs, alcohol, bile reflux or autoimmune disease. For those types, removing the cause and protecting the lining matter far more. See how long does gastritis last? and my gastritis diet guide.
Best Probiotics for Gastritis
| Probiotic | Best evidence for | Notes |
|---|---|---|
| Saccharomyces boulardii | Higher eradication rates and fewer side effects during H. pylori treatment | A yeast, so it isn’t killed by antibiotics. Strongest evidence overall. |
| Lactobacillus reuteri | Lowering H. pylori load and dyspeptic symptoms | Doesn’t eradicate H. pylori on its own. |
| Lactobacillus + Bifidobacterium blends | Higher eradication rates and fewer side effects as an add-on | Products vary widely, so look for named strains. |
How to take them
- Timing: start with your antibiotic course, or a few days before, and continue for one to two weeks after it ends.
- Bacterial probiotics and antibiotics: take them at least 2 hours apart so the antibiotic doesn’t kill the probiotic straight away. This matters less for S. boulardii.
- Choose named strains with studied doses rather than generic “probiotic blend” products with no strain listed.
- Expect mild bloating or gas for the first few days.
Who should be careful
Probiotics are very safe for most people. Talk to your doctor first if you’re severely immunocompromised, have a central venous line, are critically ill, or have had recent major gut surgery, because rare bloodstream infections have been reported in these groups.
Yogurt, Kefir and Fermented Foods
Fermented foods contain live cultures, and some people find them soothing. However, they usually contain fewer organisms than supplements, the strains vary, and they haven’t been tested in the same trials, so they aren’t a substitute for a studied supplement during H. pylori treatment.
There’s also a reflux caveat. Yogurt and kefir are acidic (around pH 4 to 4.5). If you have gastritis alongside reflux, and especially if you have throat symptoms, acidic foods can reactivate pepsin lodged in throat tissue. In that situation, a capsule probiotic is a better choice than a daily yogurt. See is yogurt good for acid reflux? and is kefir good for acid reflux?
What About Probiotics for Reflux?
Gastritis and reflux often go together, and many people want one supplement for both. The evidence for probiotics in reflux is a separate topic with its own strengths and gaps. I cover it in best probiotics for acid reflux. If you’re on a long-term PPI, it’s also worth reading about SIBO and reflux, because reduced stomach acid can change the gut’s bacterial balance.
Conclusion
Probiotics are a useful add-on for gastritis, but not a cure. Their best-proven role is alongside H. pylori antibiotic treatment. Saccharomyces boulardii in particular raises eradication rates and roughly halves treatment side effects, which helps people complete their course. Lactobacillus reuteri and Lactobacillus/Bifidobacterium blends have supportive evidence too. On their own, though, probiotics only dampen H. pylori; they don’t clear it.
So the order matters. Get tested, treat the cause, use a well-studied probiotic to get through treatment comfortably, and support your stomach with gentle food while it heals.
If you have reflux or throat symptoms as well as gastritis, the food side becomes even more important, because you need meals that are gentle on the stomach and low in acid for the throat. The Wipeout Diet Plan is built around exactly that. I built it originally for LPR, and it works just as well for GERD and an irritated stomach.
Frequently Asked Questions
Can probiotics cure gastritis?
Not on their own in most cases. They can reduce H. pylori levels and symptoms, but they rarely eradicate the infection. Their proven role is improving the success and tolerability of antibiotic treatment.
What is the best probiotic for H. pylori gastritis?
Saccharomyces boulardii has the strongest evidence. In a meta-analysis of 11 trials, it raised eradication rates from 71% to 80% when added to treatment and cut side effects by more than half.
Should I take probiotics during H. pylori treatment?
For most people, it’s a reasonable choice that may improve your chance of clearing the infection and reduce side effects like diarrhea. Check with your doctor, and space bacterial probiotics at least 2 hours from your antibiotics.
Can probiotics make gastritis worse?
It’s uncommon. Some people get temporary bloating or gas when they start. If symptoms clearly worsen, stop and discuss it with your doctor.
Is yogurt good for gastritis?
Plain, low-fat yogurt is tolerated by some people with gastritis. However, it’s acidic, contains fewer probiotic organisms than supplements, and isn’t a good choice if you also have reflux or throat symptoms.
How long should I take probiotics for gastritis?
For H. pylori treatment, most studies used probiotics during the antibiotic course and for about one to four weeks afterward. There’s no strong evidence for long-term use specifically for gastritis.
Do probiotics help gastritis caused by ibuprofen?
There’s little evidence for this. With NSAID gastritis, stopping or reducing the drug, and taking a PPI if your doctor recommends one, makes a much bigger difference.
Research & References
- A meta-analysis of 13 randomized trials (2,306 patients) finding that probiotic supplementation increased H. pylori eradication rates (relative risk 1.15) and reduced therapy-related adverse events [Lü et al., PLoS One, 2016].
- A meta-analysis of 10 trials finding that Lactobacillus- and Bifidobacterium-containing probiotic compounds roughly doubled the odds of H. pylori eradication (OR 2.07 by intention-to-treat) and reduced side effects [Wang et al., Journal of Clinical Gastroenterology, 2013].
- An updated meta-analysis of 11 trials (2,200 participants) finding that Saccharomyces boulardii raised eradication from 71% to 80% and reduced overall adverse effects (RR 0.44) and diarrhea (RR 0.51) [Szajewska et al., Alimentary Pharmacology & Therapeutics, 2015].
- A double-blind trial of 40 H. pylori-positive people, finding that Lactobacillus reuteri reduced bacterial load and dyspeptic symptoms but didn’t affect the outcome of subsequent eradication therapy [Francavilla et al., Helicobacter, 2008].
- The Maastricht VI/Florence consensus on H. pylori management, including the role of probiotics in reducing treatment side effects [Malfertheiner et al., Gut, 2022].
David Gray
12 years living with LPR · Consultant & researcher
I've lived with LPR for twelve years — the misdiagnoses, the PPI courses that did nothing, the slow work of figuring out what actually helps. Wipeout Reflux is where I translate the research into plain terms for people stuck in the same place. Every claim here is sourced to peer-reviewed work, and I consult one-to-one with LPR sufferers.