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Head-to-head evidence comparison — which supplement is right for you?
B. longum 1714 vs Probiotics: Probiotics has the stronger overall evidence (9 vs 3/10); they're alternatives for support mood — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Probiotics 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
12 of 13 studies with measurable effects showed benefit.
Top outcomes
1 x 10^9 to 1 x 10^10 CFU daily — the two trials that state a dose used 1 x 10^10 CFU/day (depression) and a minimum of 1 x 10^9 CFU/day (pregnancy). Neither found a benefit on its primary endpoint, so this is the dose range that has been tested, not a dose shown to work.
Any time of day
Freeze-dried capsule or sachet standardized to B. longum 1714
10-20 billion CFU (no cited trial states the dose it used)
With or without food (strain-dependent), Same time daily for consistency
Capsules with multiple strains
Redundant rather than harmful, and the strain-level claims are weak: the two largest trials both missed their primary endpoints and every objective measurement taken (actigraphy, behavioural testing) was null.
Choose one. Do not expect a generic blend to reproduce this strain's research, or this strain to deliver gut benefits it has never been tested for.
4 weeks
8 weeks
n/a
n/a
2-4 weeks
4-8 weeks
4-8 weeks
First 1-2 weeks
Effects of Bifidobacterium longum 1714 on low mood and related symptoms: A randomized, double-blind, placebo-controlled trial.
Exp Clin Psychopharmacol (2026) · Rct · n=168
PRIMARY ENDPOINT MISSED: BDI-II change vs placebo was -0.303 (95% CI -1.957 to 1.35, p=.718) at week 4 and -1.432 (95% CI -3.30 to 0.44, p=.132) at week 8
Bifidobacterium longum 1714 improves sleep quality and aspects of well-being in healthy adults: a randomized, double-blind, placebo-controlled clinical trial.
Sci Rep (2024) · Rct · n=89
PRIMARY ENDPOINT MISSED: PSQI global score improved in both groups, with no significant advantage for the strain
Bifidobacterium longum 1714 as a translational psychobiotic: modulation of stress, electrophysiology and neurocognition in healthy volunteers.
Transl Psychiatry (2016) · Pilot · n=22
PubMed classifies this as a Controlled Clinical Trial, NOT a Randomized Controlled Trial
Preventive Effect of Probiotics on Oral Mucositis Induced by Cancer Treatment: A Systematic Review and Meta-Analysis
International journal of molecular sciences (2022) · Meta analysis · n=708
Three trials using Lactobacilli-based probiotics reported that the incidence of oral mucositis in the probiotic group was significantly low (risk ratio [RR] = 0.84, 95% confidence interval [CI] = 0.77−0.93, p = 0.0004).
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.
Probiotics for the prevention of Clostridioides difficile-associated diarrhea in adults and children.
The Cochrane database of systematic reviews (2025) · Meta analysis · n=9955
Probiotics may prevent CDAD: NNTB 65 (95% CI 48 to 97)
Probiotics has a higher evidence score (9/10 vs 3/10) and wins in 2 of 3 categories.
For support mood, Probiotics has a higher relevance score (60 vs 20).
Redundant rather than harmful, and the strain-level claims are weak: the two largest trials both missed their primary endpoints and every objective measurement taken (actigraphy, behavioural testing) was null. Choose one. Do not expect a generic blend to reproduce this strain's research, or this strain to deliver gut benefits it has never been tested for. Consult a healthcare provider for personalized advice.
The honest tier list — proven staples vs situational vs mostly marketing. The hub the other guides feed into.
On Ozempic/Wegovy/Mounjaro? What actually helps — muscle preservation, GI relief, nutrient gaps (no upsell).
Saffron, EPA omega-3, SAMe have real adjunct evidence — but these aren’t a substitute for care, and some interact dangerously.
Probiotics vs prebiotics vs synbiotics, the CFU myth, and what actually helps bloating.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.