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Wang H, Li L, Qin LL et al (2018) Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency
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We'll make sure you understand that this is investigational territory
After a discussion we tried stopping injections and monitoring
[1] Other rare side effects noted (mostly in older literature or high-dose use) include: polycythemia vera and peripheral vascular thrombosis in patients receiving repeated injections (though these associations are not well understood, they were listed in prior product literature as possible adverse events)
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