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Head-to-head evidence comparison — which supplement is right for you?
Multivitamin vs Orlistat: Multivitamin has the stronger overall evidence (6 vs 6/10); they work on different things and are often used together, not either/or. Take the 60-second quiz for a pick tailored to your goals.
Multivitamin wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
4 of 7 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
1 serving daily (as directed on label, typically 1-2 tablets/capsules)
With breakfast, With lunch (if GI sensitive)
Capsule or softgel
Prescription Xenical: 120 mg three times daily (360 mg/day), taken with or up to 1 hour after each main fat-containing meal. Over-the-counter Alli: 60 mg three times daily (180 mg/day). Skip the dose if a meal is missed or contains no fat. Used alongside a reduced-calorie diet in which fat supplies roughly 30% of energy — a higher-fat meal makes the gastrointestinal side effects markedly worse, not the weight loss better.
with-meals
Xenical 120 mg capsule three times daily with meals (prescription)
Lower delivery of the fat-soluble fraction of a multivitamin if taken alongside orlistat.
A daily multivitamin is standard alongside orlistat — take it at bedtime, at least two hours away from any orlistat dose.
3-6 months
4-8 weeks
2-6 weeks
6-12 weeks
4–12 weeks to onset; maximal by 6–12 months
Year 2 of continuous use
Years
3–12 months
Effect of multivitamin-mineral supplementation versus placebo on cognitive function: results from the clinic subcohort of the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) randomized clinical trial and meta-analysis of 3 cognitive studies within COSMOS
The American Journal of Clinical Nutrition (2024) · Meta analysis · n=5765
Multivitamin-mineral supplementation significantly improved global cognition vs placebo (pooled meta-analysis)
Multivitamin Supplementation Improves Memory in Older Adults: A Randomized Clinical Trial
The American Journal of Clinical Nutrition (2023) · Rct · n=3562
Daily multivitamin supplementation for 3 years significantly improved immediate and delayed recall memory
Effects of cocoa extract and a multivitamin on cognitive function: A randomized clinical trial
Alzheimer's & Dementia (2023) · Rct · n=2262
Multivitamin-mineral supplementation (not cocoa extract) drove significant cognitive improvements in COSMOS-Mind
XENical in the prevention of diabetes in obese subjects (XENDOS) study: a randomized study of orlistat as an adjunct to lifestyle changes for the prevention of type 2 diabetes in obese patients.
Diabetes Care (2004) · Rct · n=3305
4-year double-blind trial randomising 3,305 obese patients (BMI ≥30) to lifestyle changes plus orlistat 120 mg or placebo three times daily
Randomised placebo-controlled trial of orlistat for weight loss and prevention of weight regain in obese patients. European Multicentre Orlistat Study Group.
Lancet (1998) · Rct · n=688
743 obese patients (BMI 28–47) entered a 4-week placebo lead-in at 15 European centres; 688 were randomised double-blind to orlistat 120 mg three times a day or placebo for 1 year on a 600 kcal/day-deficit diet, then reassigned for a second 52-week weight-maintenance period
Weight control and risk factor reduction in obese subjects treated for 2 years with orlistat: a randomized controlled trial.
JAMA (1999) · Rct · n=892
2-year randomised, double-blind, placebo-controlled trial at 18 US research centres; 1,187 obese adults (BMI 30–43) entered and 892 were randomised, with 223 placebo- and 657 orlistat-treated subjects in the intent-to-treat analysis
Based on COSMOS trials (n=5765) showing equivalent of 2.0 years cognitive decline prevention. Effects most pronounced in those with cardiovascular disease. Study duration was 3 years. Effectiveness reflects conservative interpretation of memory and global cognition improvements.
AI-estimated from published studies. Interpret as directional guidance.
Multivitamin has a higher evidence score (6/10 vs 6/10) and wins in 2 of 3 categories.
Lower delivery of the fat-soluble fraction of a multivitamin if taken alongside orlistat. A daily multivitamin is standard alongside orlistat — take it at bedtime, at least two hours away from any orlistat dose. Consult a healthcare provider for personalized advice.
On Ozempic/Wegovy/Mounjaro? What actually helps — muscle preservation, GI relief, nutrient gaps (no upsell).
Safe, but no benefit if you’re not filling a gap. Who actually needs one — and who doesn’t.
Start with 2–3 foundations, add one at a time, build by goal — without wasting money.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.