Probiotics
Gut
Live bacteria. Effects are strain-specific — "probiotic" alone tells you nothing.
What the evidence says
Good human evidence for specific strains in specific situations (antibiotic-associated diarrhoea, some IBS). Generic multi-strain products for general wellness are much weaker.
What studies used
Strain- and product-specific. Product-dependent.
Reported from published studies and product labelling — a record of what was used in research, not a recommendation. What is right for you is a conversation with a clinician.
Watch out for
- Match the exact strain to the studied use, not the marketing
Evidence base
established literature
Large human evidence base: several phase 3 or 4 trial reports, plus multiple meta-analyses or systematic reviews.
This letter measures how much human research exists, not whether it works for you — the tier above (Moderate) is the read on quality.
Research (12)
- Role of Probiotics in Human Gut Microbiome-Associated DiseasesJ Microbiol Biotechnol · 2019
- Efficacy of Probiotics in Irritable Bowel Syndrome: Systematic Review and Meta-analysisGastroenterology · 2023
- The history of probiotics: the untold storyBenef Microbes · 2015
- The pros, cons, and many unknowns of probioticsNat Med · 2019
- Risk and safety of probioticsClin Infect Dis · 2015
- Probiotics for Gastrointestinal Conditions: A Summary of the EvidenceAm Fam Physician · 2017
- Probiotics in Cosmetic and Personal Care Products: Trends and ChallengesMolecules · 2021
- Role of Probiotics in Human HealthCureus · 2022
- Probiotics in CancerFront Oncol · 2021
- ProbioticsAm J Health Syst Pharm · 2010
- Armored probiotics for oral deliverySmart Med · 2023
- Probiotics for the Prevention of Antibiotic-Associated DiarrheaHealthcare (Basel) · 2022
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