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Probiotics

Also called: probiotic, lactobacillus, good bacteria

Live bacteria and yeasts (such as Lactobacillus, Bifidobacterium and Saccharomyces boulardii) similar to those in the gut.

Why people take it
Gut health, digestion, diarrhoea and immunity.
What the evidence says
Some strains help prevent diarrhoea from antibiotics. Effects depend on the exact strain, and for most other uses the evidence is mixed.
Be careful
Avoid if you are seriously ill or have a weak immune system (for example during chemotherapy) unless your doctor agrees.
In food
Curd (dahi), yogurt, buttermilk, idli and dosa batter, and other fermented foods.

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Common questions

What is Probiotics?

Live bacteria and yeasts (such as Lactobacillus, Bifidobacterium and Saccharomyces boulardii) similar to those in the gut.

Why do people take Probiotics?

Gut health, digestion, diarrhoea and immunity.

Does Probiotics work?

Some strains help prevent diarrhoea from antibiotics. Effects depend on the exact strain, and for most other uses the evidence is mixed.

Is Probiotics safe?

Avoid if you are seriously ill or have a weak immune system (for example during chemotherapy) unless your doctor agrees.

Sources and further reading

NIH Office of Dietary Supplements: probiotics

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.