Probiotics
Also known as: lactobacillus, bifidobacterium, probiotic blend, Saccharomyces boulardii
Recommended Dosage
10–50 billion CFU
Probiotics are live microorganisms that confer health benefits when consumed in adequate amounts. The gut microbiome is now recognized as a key regulator of immune function, metabolism, mood (via the gut-brain axis), and even cognitive function. Not all probiotics are equal — benefits are strain-specific, meaning a Lactobacillus rhamnosus GG has different effects than Lactobacillus acidophilus. Choosing the right strain for your specific goal is essential.
TL;DR: Beneficial bacteria for gut health. Strain selection matters — L. rhamnosus GG, B. infantis 35624, and S. boulardii are best-studied.
Evidence
Grade B
Studies
3
Interactions
3
Forms
4
Evidence Rating: Grade B — Moderate Evidence
Some RCTs with positive results, or strong observational evidence. More research may refine our understanding.
Forms Comparison
Lactobacillus/Bifidobacterium Blends
~ Moderate AbsorptionThe most studied probiotic genera. Look for specific strains (e.g., LGG, BB-12) with clinical evidence.
Saccharomyces boulardii
✓ High AbsorptionA beneficial yeast, not a bacteria. Survives antibiotics and is specifically studied for diarrhea prevention.
Spore-Based (Bacillus)
✓ High AbsorptionSpore-forming bacteria that survive stomach acid well. Growing evidence base.
Soil-Based Organisms (SBO)
~ Moderate AbsorptionOrganisms naturally found in soil. Less clinical evidence but theoretically mirrors ancestral exposure.
Interaction Warnings
Live bacteria may pose risk in immunocompromised individuals
Antifungals kill S. boulardii — do not combine
Antibiotics may reduce probiotic effectiveness. Separate by 2+ hours.
⚠️ Important Notes
- Strain-specific benefits — not all probiotics are equal
- Start slowly to avoid bloating
- Immunocompromised: consult physician
Clinical Evidence (3 studies)
Probiotics for antibiotic-associated diarrhea
Hempel S et al. (2012) — JAMA
Significantly reduced antibiotic-associated diarrhea risk
View on PubMedL. rhamnosus GG for C. diff prevention
Szajewska H et al. (2007) — J Pediatr
Meta-analysis: L. rhamnosus GG prevents AAD
View on PubMedB. infantis 35624 for IBS
O'Mahony L et al. (2005) — Gastroenterology
Normalized cytokine ratio in IBS patients
View on PubMedAlternatives to Consider
These supplements target similar goals and may be worth considering alongside or instead of Probiotics.
Ginger
Grade AExcellent evidence for anti-nausea effects (pregnancy, chemotherapy, post-op). Also anti-inflammatory with COX-2 inhibition.
Glutamine
Grade BConditionally essential amino acid that is the primary fuel for gut lining cells. RCT evidence for IBS and leaky gut.
Psyllium Husk
Grade ASoluble fiber with FDA-approved health claim for cholesterol reduction. Also effective for blood sugar control and constipation.
Related Supplements
NAC (N-Acetyl Cysteine)
Grade B — Moderate EvidencePrecursor to glutathione (master antioxidant). Strong evidence for respiratory health, liver support, and psychiatric conditions.
Glutamine
Grade B — Moderate EvidenceConditionally essential amino acid that is the primary fuel for gut lining cells. RCT evidence for IBS and leaky gut.
Ginger
Grade A — Strong EvidenceExcellent evidence for anti-nausea effects (pregnancy, chemotherapy, post-op). Also anti-inflammatory with COX-2 inhibition.
Vitamin D3
Grade A — Strong EvidenceEssential hormone precursor. Most people in northern latitudes are deficient. Strong evidence for immunity, bone health, and mood.
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⚕️ Important Disclaimer
This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.
DoseGrade does not sell supplements and has no affiliate relationships with supplement manufacturers.