This article is general information, not medical advice. If a symptom is new, getting worse or worrying you, talk to a doctor.
Probiotics are one of the first things people reach for when they feel bloated. Some find they help. Others notice nothing, or feel more bloated at first. Here is what the evidence says.
How probiotics might help
Probiotics are live bacteria or yeasts. The idea is that they shift the balance of gut bacteria, reduce gas-producing fermentation and calm a sensitive gut. Different strains do different things, so “probiotics” is not one treatment but many.
What the research shows
- For IBS: reviews suggest some probiotics may improve overall symptoms and bloating, but studies vary widely in strains, doses and quality. The American Gastroenterological Association does not recommend probiotics for IBS outside clinical trials, while some other guidelines suggest a short trial is reasonable.
- For general bloating without IBS: there is little good evidence.
- After antibiotics: some probiotics reduce antibiotic-associated diarrhoea, which is a different problem.
How to try a probiotic properly
- Rule out other causes first. Constipation, a food trigger or coeliac disease will not be fixed by a probiotic. See why am I bloated every day?
- Pick named strains, for example Bifidobacterium longum 35624 or Lactobacillus plantarum 299v, which have been studied in IBS.
- Take one product daily for four weeks. Do not combine several at once.
- Track your symptoms on a simple 0 to 10 scale.
- Stop if there is no improvement after four weeks. Mild extra gas in the first few days is common and usually settles.
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Who should check with a doctor first
People with a weakened immune system, serious illness, a central line or recent major surgery should not start probiotics without medical advice.
Bottom line
Probiotics are worth a fair four-week test for some people with IBS-type bloating, but they are not a guaranteed fix. Eating habits, fibre, constipation and food triggers usually make a bigger difference.
Frequently asked questions
How long does it take for probiotics to help bloating?
Give one product about four weeks of daily use. If there is no improvement by then, it is unlikely to help.
Can probiotics make bloating worse?
Some people get more gas and bloating in the first few days. It usually settles within a week or two. Stop if it does not.
Which probiotic is best for bloating?
There is no single best one. Strains with some IBS research include Bifidobacterium longum 35624 and Lactobacillus plantarum 299v, but responses vary between people.
Do over-the-counter probiotics work?
Some do for specific problems, such as reducing diarrhoea from antibiotics. For bloating, results are mixed and depend on the strain and the person.
Can you take prebiotics and probiotics together?
Yes. Prebiotics are fibres that feed gut bacteria. Note that prebiotic fibres such as inulin can increase gas and bloating in some people.
What are the side effects of probiotics?
Mild gas and bloating in the first days are the most common. People with weakened immune systems should talk to a doctor before taking them.