Probiotics
Some strains help. Which one matters.
Grade B: Some human proof
Small, early or mixed results in people.
The grade is for the use people talk about, not for every use. Filed under: Gut health.
How it works
Live bacteria or yeast taken by mouth.
How it was given in studies
By mouth. In the trials people swallowed it as a capsule, tablet, powder or drink.
This is what the studies did. It is not a how-to.
What studies saw
A review of 42 trials in 11,305 adults found the risk of diarrhea from antibiotics fell by about a third, and only certain species worked. For IBS, a review of 82 trials found some strains may help, with low certainty.
The trade-off
A result for one strain does not carry over to another, and most have not been compared head to head in the trials we found.
When it showed up, in studies
Depends on the strain and the problem.
Sources
Put this grade on your site
Copy the line below. The badge links back to this page, so readers can check the sources. It grades the compound in studies. It does not rate any product or seller.
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Keep going
We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.