Is Vitamin B12 Safe with Semaglutide, Liraglutide (Ozempic, Wegovy)?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Monitor serum B12 levels every 6–12 months. Consider supplementing with 1000 mcg/day of methylcobalamin or cyanocobalamin, preferably in sublingual or injectable form to bypass intrinsic factor dependency. Report symptoms of numbness, fatigue, or cognitive changes to your provider.
Why this interaction occurs
GLP-1 agonists significantly slow gastric emptying and reduce gastric acid secretion, which impairs the release of intrinsic factor from parietal cells. Intrinsic factor is essential for ileal absorption of vitamin B12. Combined with dramatically reduced dietary intake due to appetite suppression, patients on GLP-1 therapy face compounded risk of B12 depletion over time, potentially leading to megaloblastic anemia and peripheral neuropathy.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 146,406 reports mentioning Semaglutide, Liraglutide (Ozempic, Wegovy). This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Semaglutide, Liraglutide (Ozempic, Wegovy) + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Vitamin B12 interactions → · All Semaglutide, Liraglutide (Ozempic, Wegovy) interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.