Vitamin App ReferenceSource-linked nutrient and bioactive reference
Menu
HomeSearchVitamins & MineralsFoods & BioactivesGoalsConditionsTagsSafety
Compare
Compare BioactivesPopulation Compare
References
About This ReferenceSource LibraryReview DashboardEvidence LegendEditorial StandardsUpdate PolicyQuality & Purchasing GuidelinesPrivacy & Feedback
For informational purposes only. Always consult a qualified medical professional before taking any supplement, herb, vitamin, mineral, or bioactive, especially if you use medications or have a medical condition. Read the full disclaimer.
Back to Foods & Bioactives
Established useReviewed

Gut Health

Probiotics

Microbes, fibers, enzymes, and food patterns that affect digestion, stool form, and the gut microbial ecosystem.

Page last reviewed: 2026-07-23 - next review due: 2027-01-23

Safety Flags

immunosuppression, serious illness, premature infants

Source Coverage

Included: US reference
Review gap: Canadian reference
Add or verify Health Canada context where an official Canadian reference exists.
Review gap: EU reference
Add or verify EFSA or EU health-claim context where an official EU reference exists.
Review gap: Clinical / safety source
Add a clinical review, safety monograph, systematic review, or other deeper safety reference before strengthening claims.

Function

Live microorganisms that can support digestive function when specific strains are consumed in adequate amounts.

Natural Sources

Yogurt with live cultures, kefir, kimchi, sauerkraut with live cultures, miso, tempeh, kombucha.

Food vs Supplement Context

Natural sources describe where this item appears in foods, culinary ingredients, or traditional preparations. Concentrated supplements can differ by dose, extract type, preparation, standardization, and medication context, so they should be evaluated separately.

Testing & Monitoring Context

  • No routine lab test establishes a required daily need for most foods and bioactives; monitoring is usually based on the intended outcome, dose, medical history, and adverse effects.
  • Probiotic context: benefits and risks are strain-specific; immune status, serious illness, and infection risk matter.

Suggested Guidelines When Purchasing

What to look for: For probiotics, labels should identify genus, species, strain, CFU at end of shelf life, storage conditions, and studied outcome.

Use caution or avoid: Avoid casual use when these flags apply: immunosuppression, serious illness, premature infants.

  • Prefer ordinary food sources first when they provide the intended compound in a practical way.
  • For supplements, require clear labeling of active ingredient, dose per serving, serving size, and other ingredients.
  • Prefer products with third-party testing or transparent contaminant testing, especially for concentrated extracts, algae, mushrooms, minerals, and sports products.
  • Do not let marketing claims override the evidence, safety flags, source coverage, or dose context on this page.
  • Match the strain to the intended outcome; total CFU count alone is not a quality signal.

Intake Guidance

Studied-use context

No official RDI exists. Meaningful guidance should be strain-specific and product-specific rather than a universal daily dose.

Evidence Summary

Digestive and immune-related outcomes

Established use

Probiotic effects are strain-specific. CFU count alone does not prove benefit, and product labels should identify genus, species, and strain.

Dose context: Products commonly list billions of CFUs, but there is no universal RDI or universal effective dose.

Caution: People who are seriously ill, immunocompromised, or premature infants need medical guidance before probiotic use.

Studies/sources: Probiotics Fact Sheet for Consumers (2026-07-23)

Evidence Legend

Established use: Supported by official guidance, regulatory claim context, strong consensus, or repeated human evidence for a specific use.
Promising: Human studies or reviews suggest benefit for specific outcomes, but evidence is not broad enough to treat as settled general guidance.
Emerging: Early human, mechanistic, or mixed evidence; worth tracking, but not strong enough for confident user-facing claims.
Traditional use: Historically or traditionally used, but modern clinical evidence may be limited, mixed, or product-specific.
Category example: Included to describe a supplement or food category, not because a strong health claim is attached yet.
Note: Benefits are strain-specific; not every fermented food has proven probiotic effects.

Sources

FoodData Central

U.S. Department of Agriculture - acquired 2026-07-23 - Food Database