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Head-to-head evidence comparison — which supplement is right for you?
Prenatal Multivitamin vs Saccharomyces Boulardii: Saccharomyces Boulardii has the stronger overall evidence (8.5 vs 7/10); the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Saccharomyces Boulardii wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Likely helps
4 of 4 studies with measurable effects showed benefit.
Top outcomes
1 serving daily as labelled. The verified folic acid evidence rests on 400-800 mcg daily started before conception
With meals
A prenatal containing 400-800 mcg folic acid, started at least one month before conception
250-500mg (5-10 billion CFU) daily
With or without food, At least 2 hours away from antifungals
Capsules (lyophilized)
and 4 more not shown
Best started before conception
Across pregnancy
Across pregnancy
n/a
During use
1-3 days
1-2 weeks
Effects and safety of periconceptional oral folate supplementation for preventing birth defects.
Cochrane Database Syst Rev (2015) · Meta analysis
Neural tube defects: RR 0.31 (95% CI 0.17-0.58) across 5 studies, 6,708 births — HIGH quality evidence
Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. MRC Vitamin Study Research Group.
Lancet (1991) · Rct · n=1817
27 neural tube defects total: 6 in folic acid arms vs 21 in non-folic-acid arms — 72% protective effect, RR 0.28 (95% CI 0.12-0.71)
Prevention of the first occurrence of neural-tube defects by periconceptional vitamin supplementation.
N Engl J Med (1992) · Rct · n=4753
The comparator was NOT placebo — it was a trace-element supplement (copper, manganese, zinc and a very low dose of vitamin C)
Efficacy and safety of Saccharomyces boulardii as an adjuvant therapy for the eradication of Helicobacter pylori: a meta-analysis
Frontiers in cellular and infection microbiology (2025) · Meta analysis · n=5036
Meta-analysis of 19 studies with 5,036 people with H. pylori infection, adding S. boulardii to standard eradication therapy.
Probiotics for treating acute infectious diarrhoea
The Cochrane database of systematic reviews (2020) · Meta analysis · n=12127
Effect size was similar in the sensitivity analysis and marked heterogeneity persisted.
The use of probiotics and prebiotics in decolonizing pathogenic bacteria from the gut; a systematic review and meta-analysis of clinical outcomes
Gut microbes (2024) · Meta analysis · n=2871
This review aims to analyze available evidence from human-controlled trials to determine the effect size of probiotic interventions in decolonizing AMR pathogenic bacteria from the gut.
Both points come from a meta-analysis of 10 randomised trials adding S. boulardii to bismuth quadruple therapy (PMID 40251486), whose dose subgroups found the same gain in eradication at 500 mg a day (RR 1.10, 95% CI 1.03 to 1.17) and 1000 mg a day (RR 1.08, 95% CI 1.03 to 1.12). Effectiveness is the relative gain in eradication in percent. Total adverse effects fell with S. boulardii (RR 0.53), so the side effect values are low. The authors recommend 500 mg a day for more than 10 days. The effect is as an add-on to antibiotics only, and doses are in mg of product, not CFU.
AI-estimated from published studies. Interpret as directional guidance.
Saccharomyces Boulardii has a higher evidence score (8.5/10 vs 7/10) and wins in 2 of 3 categories.
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
Folate is essential; inositol + CoQ10 are the best bets — but conception evidence is limited.
What’s safe while nursing, the truth about milk-supply herbs, and what to avoid (it passes into milk).
Safe, but no benefit if you’re not filling a gap. Who actually needs one — and who doesn’t.
Commonly recommended vs ask-your-clinician vs avoid — a general, safety-first overview.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.