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How Vitamin B12 Injections Work for Pernicious Anaemia Vitamin B12 injections in the UK contain hydroxocobalamin , which is the standard injectable formulation used in NHS practice

S2CID 23096987

Yoshino J, et al

For general scientific research and basic conditioning: 50150 mg daily, divided into 13 doses

[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)

How we reviewed this article: Current Version October 03, 2025 Written By John DiBella Fact-checked By Dr