why is b12 injections bad for you Sublingual vs. B12 Injections: Which Option Right You? – WhyNotNatural What You Need to Know
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Toxicol Pathol

Another frequently asked question is, "Does B12 expire?" Like all medications and supplements, B12 injections have a limited shelf life: Expiration Dates: Always check the expiration date labelled on your B12 injection vial

Nutrients 2016;8

Patients taking multiple medications for type 2 diabetes may conflate the effects of different drugs, leading to questions about whether Ozempic itself contains or affects B12 levels
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Reference ranges differ between labs