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Head-to-head evidence comparison — which supplement is right for you?
Vitamin B12 wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Probably helps
16 of 23 studies with measurable effects showed benefit.
Top outcomes
Prescription-only, clinician-titrated, subcutaneous once daily. Diabetes (Victoza): escalate 0.6 → 1.2 → 1.8 mg/day. Weight management (Saxenda): escalate weekly to 3.0 mg/day. DO NOT self-dose.
any
Subcutaneous once-daily injection (Victoza for diabetes, Saxenda for weight)
500-1000mcg daily for maintenance; higher for deficiency
Morning (may be energizing), With or without food
Methylcobalamin (sublingual)
Weeks to months
Months (titrated over weeks)
Months to years
Especially during dose escalation
2-4 weeks
4-8 weeks
Weeks to months
Liraglutide and Cardiovascular Outcomes in Type 2 Diabetes (LEADER).
N Engl J Med (2016) · Rct · n=9340
Double-blind cardiovascular-outcomes RCT: 9,340 patients with type 2 diabetes and high cardiovascular risk, liraglutide (up to 1.8 mg/day) vs placebo, median follow-up 3.8 years
A Randomized, Controlled Trial of 3.0 mg of Liraglutide in Weight Management (SCALE Obesity and Prediabetes).
N Engl J Med (2015) · Rct · n=3731
56-week double-blind RCT in 3,731 adults WITHOUT type 2 diabetes (BMI ≥30, or ≥27 with comorbidities), liraglutide 3.0 mg/day vs placebo plus lifestyle (2:1)
Efficacy of Liraglutide for Weight Loss Among Patients With Type 2 Diabetes: The SCALE Diabetes Randomized Clinical Trial.
JAMA (2015) · Rct · n=846
56-week double-blind RCT in 846 adults with overweight/obesity AND type 2 diabetes, liraglutide 3.0 mg vs 1.8 mg vs placebo (2:1:1)
Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis
Irish journal of medical science (2024) · Meta analysis · n=4275
Regarding the hemoglobin level, the pooled effect sizes showed no difference between all routes of administration that could reach statistical significance.
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.
Vitamin Status in Patients with Phenylketonuria: A Systematic Review and Meta-Analysis
International journal of molecular sciences (2024) · Meta analysis · n=770
The effect sizes were expressed as standardised mean differences.
Vitamin B12 has a higher evidence score (7.5/10 vs 7.5/10) and wins in 2 of 3 categories.
No known interactions between Liraglutide and Vitamin B12 have been documented in our database. However, always consult a healthcare provider before combining supplements.