Probiotics are live microorganisms that, in the right strains and amounts, may support digestive health. Here is a beginner-friendly overview.
Strains matter
“Probiotic” is not one thing. Benefits are strain-specific: a strain studied for antibiotic-associated digestive upset is not interchangeable with one studied for irritable bowel symptoms. Look for products that name specific strains and CFU counts.
What the research says
Evidence is strongest for specific uses, such as reducing antibiotic-associated digestive upset and easing some IBS symptoms. For general “gut health” in healthy people, the picture is less clear, though many tolerate them well.
Multi-Strain Probiotic (e.g. Culturelle, Align, Florastor)
- Pick a product that names its specific strain and CFU count
- Culturelle (LGG) and Florastor (S. boulardii) are among the most studied
- Benefits are strain-specific — match the strain to your goal
Widely available
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Probiotics are generally safe for healthy adults. People who are immunocompromised or seriously ill should talk to a doctor first. Start with one product at a time so you can judge how you respond.
Ready to compare products? See our guide to the best probiotic supplements, or learn how they differ from prebiotics.