The best probiotic for bloating is a specific strain with placebo-controlled human trials, not the brand with the boldest label. Lactiplantibacillus plantarum 299v has the strongest trial for bloating, Bifidobacterium longum 35624 (the strain in Align) has mixed results, and whichever you choose deserves a four-week test with a symptom diary.
Bloating is not one problem. Gas from fibre, food moving slowly, swallowed air and a gut that feels ordinary amounts of gas more strongly all feel the same from the outside, and a probiotic helps with only some of them. Below are the strains that have been tested on bloating in people and what the trials found, what Rala's catalog says about the products that carry them, how to choose and test one, and when bloating needs a doctor instead.
Why You Feel Bloated
Most bloating comes from four places, and often from more than one at once.
Gas from fermentation. Bacteria in the large bowel ferment fibre and the sugars the small bowel does not absorb: beans, onions, garlic, wheat, some fruits, sugar alcohols such as sorbitol and, for some people, dairy. The gas is normal. How much there is, and how fast it comes, depends on the food and on the bacteria doing the work.
Food moving slowly. When the bowel moves slowly, gas and stool sit longer and the belly feels full and tight. Bloating and infrequent bowel movements often travel together.
Swallowed air. Eating fast, talking while eating, fizzy drinks, chewing gum and straws all add air that has to go somewhere.
A sensitive gut. Many people with long-running bloating do not make more gas than anyone else; their gut registers ordinary amounts more strongly. Stress and the menstrual cycle can turn that sensitivity up.
A probiotic can change which bacteria do the fermenting and, in some trials, how fast things move. It cannot help with swallowed air or a food you react to, which is why both the cause and the strain matter. Our guide to probiotics for gut health covers what probiotics do more broadly.
The Probiotic Strains Studied for Bloating
A probiotic's effect belongs to its strain, the code after the species name, so a trial of one Bifidobacterium tells you little about another. We read the human trials on PubMed for the strains sold most often for bloating. This is what they measured and found.
| Strain | Trial | What happened | How strong |
|---|---|---|---|
| Lactiplantibacillus plantarum 299v (DSM 9843) | 214 adults with long-running bowel symptoms, one capsule a day for 4 weeks (2012) | Less bloating and less pain than on placebo; 78% rated the effect good or excellent, against 8% on placebo. A 2022 trial of 120 adults found no difference. | Best supported for bloating |
| Bifidobacterium longum 35624 (formerly B. infantis) | 362 women, three doses, 4 weeks (2006); 302 adults with everyday bloating, 1 billion CFU a day, 4 weeks (2017) | 2006: only the 100 million CFU dose beat placebo on bloating, gas and pain. 2017: no better than placebo on how bad the bloating was, though it gave more bloating-free days. | Mixed |
| Lactobacillus acidophilus NCFM with Bifidobacterium lactis Bi-07 | 60 adults with long-running bowel symptoms, 200 billion CFU a day in two doses, 8 weeks (2011) | Bloating eased more than on placebo at 4 and at 8 weeks. A 2017 trial of the same pair after a colonoscopy found no difference in bloating. | Promising, one small trial |
| Bifidobacterium lactis HN019 | 100 adults, 1.8 or 17.2 billion CFU a day, 14 days (2011) | Food moved through faster and most gut symptoms eased. Two larger trials in adults with constipation (228 people in 2018, 229 in 2024) found no difference from placebo. | Not confirmed in larger trials |
L. plantarum 299v has the clearest single result for bloating. In the 2012 trial, 214 adults with long-running bowel symptoms took one capsule a day or a placebo for four weeks. Pain and bloating both fell further on the probiotic, and 78% rated its effect good or excellent, against 8% on placebo. Not every trial agrees: a 2022 trial of 120 adults found no difference. A 2026 strain-by-strain review counted 299v among the strains that improved key bowel symptoms, while the largest review to date, 82 trials and 10,332 adults in 2023, rated the evidence for its overall benefit as low certainty.
B. longum 35624 is the strain in Align, the best-known probiotic sold for bloating. Its 2006 trial in 362 women is often quoted, but only the middle dose, 100 million CFU a day, beat placebo; the 1 million and 10 billion doses did not. In 2017, 302 adults from the general population with bloating at least twice a week took 1 billion CFU a day or a placebo for four weeks. Both groups improved, and the probiotic did no better on how bad the bloating was, though it gave more bloating-free days. A 2017 pooled review found the strain on its own did not reduce bloating, while combinations that included it did; the 2026 review, which pooled trials in people with long-running bowel symptoms, counted it as effective. Mixed is the fair word.
NCFM with Bi-07 is the only combination here tested with bloating as the main question. In 60 adults with long-running bowel symptoms, 200 billion CFU a day for eight weeks eased bloating more than placebo at four weeks and at eight. It is one small trial, and a 2017 trial of the same pair after a colonoscopy found no difference in bloating, so count it as promising rather than proven.
B. lactis HN019 sped food through the gut in a 2011 trial of 100 adults over 14 days, at 1.8 and 17.2 billion CFU a day, and eased most of the nine gut symptoms measured. Two larger and longer trials in adults with constipation, 228 people in 2018 and 229 in 2024, found it did no better than placebo. If slow movement is behind your bloating, the evidence for HN019 is weaker than its labels suggest.
Across every strain, the 2023 review rated the certainty that probiotics ease bloating as very low, and found side effects no more common than on placebo. In plain terms: a probiotic is a reasonable, low-risk thing to try for bloating, the strain matters, and the honest expectation is a modest change for some people rather than an answer for everyone.
What Rala's Catalog Says About the Products
Rala grades products, not just strains, on five evidence tiers that weigh the human studies, the product's own reviews and what a fixed panel of biohackers take. These are the probiotics sold for gut comfort in the catalog on 22 October 2026.
| Product | Strain | Evidence tier | What buyers report |
|---|---|---|---|
| Align Probiotic Capsules | B. longum 35624 | Tier 2 | 9,434 reviews, 84% positive |
| Culturelle Digestive Daily Probiotic Capsules | Lacticaseibacillus rhamnosus GG, with 200 mg inulin | Tier 2 | 12,258 reviews, 88% positive |
| Florastor Dual Action Probiotic | Saccharomyces boulardii CNCM I-745 | Tier 3 | 15,914 reviews; positive share being re-read |
Two notes on the table. Culturelle's strain, L. rhamnosus GG, improved key bowel symptoms in the 2026 strain review, but it has no trial of its own aimed at bloating, and the capsule adds a little inulin, a fibre that ferments. Florastor's yeast is a different kind of probiotic, and its results for long-running bowel symptoms conflict. No product in the catalog yet carries 299v or the NCFM and Bi-07 pair. The grades move as new studies and reviews come in.
Already taking a probiotic? Check it free in our supplement research tool: Rala shows its grade, the human studies on its strain and whether the dose in the bottle matches the dose that was tested.
How to Choose the Best Probiotic for Bloating
Find the strain code on the label. "Lactobacillus plantarum" is a species; "299v" is the strain the trial used. With no code on the label, there is no way to match the product to a trial.
Match the dose to the trial, through the expiry date. Look for CFU guaranteed "through expiration" rather than "at time of manufacture", because live bacteria die off on the shelf. More is not always better: in the 2006 trial of 35624, the highest dose did no better than placebo.
Store it the way the label says. Some strains need the fridge, and heat and damp kill most of them.
Change one thing at a time. Start a probiotic, a new fibre and a new diet in the same week and you will not know which one helped.
Give it four weeks, with a diary. The trials above measured results at four to eight weeks. Score your bloating from 0 to 10 each day for a week before you start and through the four weeks. If nothing has changed by then, stop and try another strain or another approach.
When a Probiotic Can Make Bloating Worse at First
Some people notice more gas or fullness in the first days of a new probiotic while the bacteria in the bowel adjust. Across 55 trials with more than 7,000 adults, side effects were no more common on probiotics than on placebo, but one thing makes a rough start likelier: a product that adds a fermenting fibre such as inulin or FOS. If your bloating is clearly worse after two weeks, stop; that product is not the right one for you.
What to Try Alongside It
Slow down at meals. Eating slowly means less swallowed air, and so do fewer fizzy drinks and less gum.
Raise fibre slowly and spread it out. Fibre helps regularity, but a big jump in one day is a recipe for gas. Add a little each week and split it across meals. Soluble fibres such as psyllium tend to make less gas than inulin.
Find the foods that do it. Beans, onions, garlic, wheat, apples, pears and sugar-free sweets made with sugar alcohols are frequent triggers. A short, structured trial of cutting the high-fermenting foods (often called a low-FODMAP diet) and adding them back one at a time, ideally with a dietitian, finds the ones that matter for you.
Walk after meals. A short walk helps gas move along instead of sitting in one place.
For the bigger picture, our guide on how to improve gut health naturally covers the foods and habits with the most evidence.
Check It Against Your Meds
Probiotics are among the safer supplements, but they are live microbes. If your immune system is weakened, by an illness or by your meds, or you have a long-term line into a vein, ask your doctor before taking one. Some meds kill the bacteria in a probiotic, so ask your pharmacist how far apart to take them; a yeast probiotic such as Saccharomyces boulardii is not affected in the same way. If you take several gut products, check them together: our guide to supplements that should not be taken together covers the pairs that clash, and the supplement interaction checker checks your whole list against your meds.
When to See a Doctor
A probiotic is for everyday bloating. See a doctor instead of trying supplements if your bloating comes with any of these:
Losing weight without trying.
Blood in your stool, or black stool.
Vomiting, or a fever.
Pain that is severe, getting worse or waking you at night.
Bloating that is new after age 50, or that never goes down.
A lasting change in your bowel habits.
In women, bloating most days together with feeling full quickly or needing to pass urine more often.
Most of the time these turn out to be nothing serious, but they are the signs worth having checked rather than handled at home.
Frequently Asked Questions
What is the best probiotic for bloating and gas?
The one whose strain has human trials for bloating. Lactiplantibacillus plantarum 299v has the strongest single trial: 214 adults had less bloating and pain than on placebo after four weeks. Lactobacillus acidophilus NCFM with Bifidobacterium lactis Bi-07 eased bloating in one small eight-week trial. Bifidobacterium longum 35624, the strain in Align, has mixed results. Choose by the strain code on the label, not the brand.
How long does it take a probiotic to help with bloating?
The trials measured results at four to eight weeks, and the 299v and 35624 trials ran for four. Give one product four weeks with a daily bloating score from 0 to 10. If nothing has changed by then, that strain is unlikely to help you.
Can probiotics make bloating worse?
For some people, at first. Some notice more gas or fullness in the first days, and products that add a fermenting fibre such as inulin or FOS make that likelier. Across 55 trials with more than 7,000 adults, side effects were no more common on probiotics than on placebo. If bloating is clearly worse after two weeks, stop.
Should I take a probiotic in the morning or at night?
No trial has compared morning and night for bloating. In a laboratory model of the stomach and small bowel, bacteria survived best when taken with a meal or 30 minutes before one, and worst 30 minutes after; the yeast Saccharomyces boulardii was not affected by timing. Pick a time with a meal that you will keep every day.
Is this medical advice? No. This guide sets out the published research on probiotics; it is not a diagnosis, and Rala isn't a medical device or a clinician. Go over any change with your doctor, especially if you take meds.
Sources
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Moeen-Ul-Haq, Babar AN, Hassan MK et al. Lactobacillus plantarum 299v against placebo in 120 adults. Journal of the Pakistan Medical Association, 2022. PubMed.
Whorwell PJ, Altringer L, Morel J et al. Encapsulated Bifidobacterium infantis 35624 at three doses in 362 women. American Journal of Gastroenterology, 2006. PubMed.
Ringel-Kulka T, McRorie J, Ringel Y. Bifidobacterium infantis 35624 for abdominal discomfort and bloating in non-patients: a multi-center placebo-controlled trial. American Journal of Gastroenterology, 2017. PubMed.
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Ringel-Kulka T, Palsson OS, Maier D et al. Lactobacillus acidophilus NCFM and Bifidobacterium lactis Bi-07 against placebo for the symptoms of bloating: a double-blind study. Journal of Clinical Gastroenterology, 2011. PubMed.
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Cheng J, Gao C, Ala-Jaakkola R et al. Eight-week supplementation with Bifidobacterium lactis HN019 and functional constipation: a randomized clinical trial. JAMA Network Open, 2024. PubMed.
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