do people complain of feeling extremely cold after b12 injections Why I feel worse a injection? Vitamin B12 Injections: Signs, Benefits
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PERNICIOUS ANAEMIA SOCIETY Improving the Diagnosis & Treatment of Pernicious Anaemia Pernicious Anaemia Newly Diagnosed

Cell Metab 19:357372

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But scientific analysis raises doubts

Nat Rev Dis Prim

This allows the vitamin to be absorbed directly into the bloodstream without having to go through the digestive system, reducing the risk of malabsorption in the stomach
