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Head-to-head evidence comparison — which supplement is right for you?
B-Complex wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
5 of 8 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
1 capsule daily (per label)
Morning with breakfast
Methylated B-complex (methylcobalamin, methylfolate)
Once-weekly subcutaneous injection, started at 2.5 mg and escalated by 2.5 mg every 4 weeks to a maintenance dose of 5, 10, or 15 mg (per the prescribing physician and approved indication)
any
Once-weekly subcutaneous injection (Mounjaro / Zepbound)
2-4 weeks
4-8 weeks
Immediate
Weeks to months
Months (dose-escalated over ~20 weeks)
Weeks to months
Mostly during titration
Dosage exploration of combined B-vitamin supplementation in stroke prevention: a meta-analysis and systematic review
The American journal of clinical nutrition (2024) · Meta analysis · n=76664
In areas without and with partial folic acid fortification, combined B-vitamin supplementation significantly reduced the risk of stroke by 34% [RR: 0.66; 95% confidence interval (CI): 0.50, 0.86] and 11% (RR: 0.89; 95% CI: 0.79, 1.00), respectively.
A Comparative Study Evaluating the Effectiveness of Folate-Based B Vitamin Intervention on Cognitive Function of Older Adults under Mandatory Folic Acid Fortification Policy: A Systematic Review and Meta-Analysis of Randomized Controlled Trials
Nutrients (2024) · Meta analysis · n=42768
The meta-analysis on the effects of folate-based B vitamin supplementation on cognitive function showed a significant overall impact (Z = 3.84; p = 0.0001; SMD, 0.18; 95% CI, 0.09, 0.28).
A Systematic Review and Meta-Analysis of B Vitamin Supplementation on Depressive Symptoms, Anxiety, and Stress: Effects on Healthy and 'At-Risk' Individuals
Nutrients (2019) · Meta analysis · n=2015
Regarding individual facets of mood, B vitamin supplementation benefited stress (n = 958, SMD = 0.23, 95% CI = 0.02, 0.45, p = 0.03).
Tirzepatide versus Semaglutide Once Weekly in Patients with Type 2 Diabetes.
N Engl J Med (2021) · Rct · n=1879
Open-label 40-week phase-3 head-to-head RCT (SURPASS-2) in 1879 patients with type 2 diabetes, tirzepatide 5/10/15 mg vs semaglutide 1 mg
Tirzepatide Once Weekly for the Treatment of Obesity.
N Engl J Med (2022) · Rct · n=2539
72-week phase-3 double-blind RCT (SURMOUNT-1) in 2539 adults with obesity (without diabetes), tirzepatide 5/10/15 mg vs placebo
Tirzepatide as Compared with Semaglutide for the Treatment of Obesity.
N Engl J Med (2025) · Rct · n=751
Phase-3b open-label head-to-head RCT (SURMOUNT-5) in 751 adults with obesity but without diabetes, max-tolerated tirzepatide vs max-tolerated semaglutide
Multiple meta-analyses show small but statistically significant benefits for cognitive function in older adults and stroke prevention populations. Effect sizes are modest (SMD ~0.15-0.18). Benefits may be more pronounced in B-vitamin deficient populations.
AI-estimated from published studies. Interpret as directional guidance.
B-Complex has a higher evidence score (6.5/10 vs 7.8/10) and wins in 2 of 3 categories.
No known interactions between B-Complex and Tirzepatide have been documented in our database. However, always consult a healthcare provider before combining supplements.