The short answer
No interaction with your GLP-1 — but if you also take metformin, B12 monitoring is worth asking your prescriber about.
Generally safeNo known interaction
Why it matters
B12 absorption is not affected by GLP-1 receptor agonists. The relevant interaction is with metformin, which can reduce B12 over time; many GLP-1 users also take metformin.
What to do
No restriction. If you take metformin alongside your GLP-1, ask your prescriber to check B12 annually. Reduced appetite on GLP-1s can lower dietary B12 intake, so a B-complex is reasonable insurance.
Ask your prescriber
“I take Vitamin B12. Is Foundayo (orforglipron) safe with it, and what should we monitor?”
How Vitamin B12 and Foundayo (orforglipron) interact
B12 absorption is not affected by GLP-1 receptor agonists. The relevant interaction is with metformin, which can reduce B12 over time; many GLP-1 users also take metformin.
What to do
No restriction. If you take metformin alongside your GLP-1, ask your prescriber to check B12 annually. Reduced appetite on GLP-1s can lower dietary B12 intake, so a B-complex is reasonable insurance.
Before you start Foundayo (orforglipron)
A licensed prescriber reviews your full medication and supplement list before prescribing a GLP-1. If you take Vitamin B12, mention it at your consultation.
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Same question, other GLP-1s
Other things people check with Foundayo (orforglipron)
Full Vitamin B12 interaction profile
See Vitamin B12 reviewed against every GLP-1 on one page: Vitamin B12 + GLP-1 interactions
Sources
Educational information, not medical advice. Always confirm interactions with your prescriber or pharmacist.