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Head-to-head evidence comparison — which supplement is right for you?
Modafinil vs Probiotics: Probiotics has the stronger overall evidence (9 vs 5/10); the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Probiotics wins 3 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
Approved dosing is 200 mg once daily in the morning for narcolepsy and OSA, or 200 mg taken ~1 hour before the start of a night shift for shift-work sleep disorder. A prescription drug; off-label cognitive use is not an approved or standardized regimen.
Morning
Oral tablet (modafinil)
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
Hours (per dose); weeks for steady benefit
Per dose (acute)
Acute
Throughout use
2-4 weeks
4-8 weeks
4-8 weeks
First 1-2 weeks
Randomized trial of modafinil for the treatment of pathological somnolence in narcolepsy. US Modafinil in Narcolepsy Multicenter Study Group.
Annals of neurology (1998) · Rct · n=283
Pivotal placebo-controlled, double-blind, 18-center RCT in 283 narcolepsy patients (modafinil 200 or 400 mg vs placebo)
Randomized trial of modafinil as a treatment for the excessive daytime somnolence of narcolepsy: US Modafinil in Narcolepsy Multicenter Study Group.
Neurology (2000) · Rct · n=271
Second pivotal 9-week, placebo-controlled, double-blind, 21-center RCT (n=271; 200 or 400 mg vs placebo)
Modafinil for excessive sleepiness associated with shift-work sleep disorder.
The New England journal of medicine (2005) · Rct · n=209
3-month double-blind RCT of 200 mg modafinil before each night shift vs placebo in 209 shift-work-sleep-disorder patients (NEJM)
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 5/10) and wins in 3 of 3 categories.
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
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.