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evidence · mechanism · dose
Supplements/Compound

Lactobacillus Probiotics

aka L. rhamnosus · L. acidophilus

Lactic acid bacteria supporting gut barrier, immunity, and women's urogenital health.

Gut HealthImmune FunctionWomen's Health

Overview

Lactic acid bacteria supporting gut barrier, immunity, and women's urogenital health.

Natural sources
  • Yogurt
  • Kefir
  • Fermented foods
Common forms
  • Multi-strain capsule
  • Strain-specific (L. rhamnosus GG, L. reuteri)

Mechanism of action

Lactic acid production lowers gut pH, competes with pathogens, modulates immune signaling.

Pathways
  • · Pathogen competition
  • · Immune modulation

Effects on the body

Supports
Gut barrier
Decreases
Antibiotic-associated diarrhea

Organ system effects

Digestive / Gut

Reduces AAD by ~50%.

Evidence-based benefits

Prevents antibiotic-associated diarrhea (L. rhamnosus GG)

Strong evidence

Reduces BV recurrence (L. crispatus, L. rhamnosus)

Moderate evidence

Potential side effects

Common
  • · Gas
  • · Bloating
Rare
    Serious
    • · Bacteremia in severely immunocompromised

    Drug interactions

    Antibiotics
    Take 2 h apart.
    minor
    Immunosuppressants
    Risk of infection.
    moderate

    Safety & non-supplemental interactions

    Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.

    Avoid with these conditions
    • ·Autoimmune disease (theoretical immune activation)
    Avoid / monitor with these medications
    • ·Immunosuppressants

    Supplement interactions

    Pairs well with

    None listed.

    Avoid combining with

    No specific avoidances listed.

    Dosing & bioavailability

    Typical dose
    10–50 billion CFU/d

    Where to buy

    Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

    Compound
    Lactobacillu…
    Amazon
    Wide selection · fast shipping
    Compound
    Lactobacillu…
    iHerb
    Global delivery · curated brands
    Compound
    Lactobacillu…
    Thorne
    Practitioner-grade · NSF tested

    Scientific evidence (9)

    Meta-analysisJAMA · 2012

    Probiotics for antibiotic-associated diarrhea

    Hempel S, et al.

    Meta-analysis of 82 RCTs of probiotics during antibiotics.

    Key findings

    42% reduction in antibiotic-associated diarrhea.

    Open study
    Systematic reviewPubMed (NLM) · 1970

    PubMed: Lactobacillus Probiotics — Prevents antibiotic-associated diarrhea

    Live PubMed search

    Live results for "Lactobacillus Probiotics Prevents antibiotic-associated diarrhea" across the PubMed/MEDLINE peer-reviewed index.

    Key findings

    Opens current human and preclinical literature matching Lactobacillus Probiotics and "Prevents antibiotic-associated diarrhea". Filter by RCT, meta-analysis, or year on the results page.

    Open study
    Systematic reviewPubMed (NLM) · 1970

    PubMed: Lactobacillus Probiotics — Reduces BV recurrence

    Live PubMed search

    Live results for "Lactobacillus Probiotics Reduces BV recurrence" across the PubMed/MEDLINE peer-reviewed index.

    Key findings

    Opens current human and preclinical literature matching Lactobacillus Probiotics and "Reduces BV recurrence". Filter by RCT, meta-analysis, or year on the results page.

    Open study
    Systematic reviewPubMed (NLM) · 1970

    PubMed: Lactobacillus Probiotics — randomized controlled trial

    Live PubMed search

    Live results for "Lactobacillus Probiotics randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

    Key findings

    Opens current human and preclinical literature matching Lactobacillus Probiotics and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

    Open study
    Systematic reviewPubMed (NLM) · 1970

    PubMed: Lactobacillus Probiotics — meta-analysis

    Live PubMed search

    Live results for "Lactobacillus Probiotics meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

    Key findings

    Opens current human and preclinical literature matching Lactobacillus Probiotics and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

    Open study
    Systematic reviewPubMed (NLM) · 1970

    PubMed: Lactobacillus Probiotics — pharmacokinetics

    Live PubMed search

    Live results for "Lactobacillus Probiotics pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

    Key findings

    Opens current human and preclinical literature matching Lactobacillus Probiotics and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

    Open study
    Systematic reviewPubMed (NLM) · 1970

    PubMed: Lactobacillus Probiotics — safety adverse events

    Live PubMed search

    Live results for "Lactobacillus Probiotics safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

    Key findings

    Opens current human and preclinical literature matching Lactobacillus Probiotics and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

    Open study
    Systematic reviewPubMed (NLM) · 1970

    PubMed: Lactobacillus Probiotics — dose response

    Live PubMed search

    Live results for "Lactobacillus Probiotics dose response" across the PubMed/MEDLINE peer-reviewed index.

    Key findings

    Opens current human and preclinical literature matching Lactobacillus Probiotics and "dose response". Filter by RCT, meta-analysis, or year on the results page.

    Open study
    Systematic reviewGoogle Scholar · 1970

    Google Scholar: Lactobacillus Probiotics — clinical evidence

    Live Scholar search

    Cross-database citation index for Lactobacillus Probiotics as it relates to "clinical evidence".

    Key findings

    Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

    Open study
    Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.