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Conditions where the bone marrow overproduces blood cells, including polycythemia vera, chronic myeloid leukemia (CML), and hypereosinophilic syndrome , can cause elevated B12 levels
Risks and Side Effects While vitamin B12 injections are generally safe, they can have side effects and risks, especially if not administered correctly
& Laplante, M
[17] These effects, if they occur, tend to resolve within a short time
If youre deficient in B12, the reduced red blood cell count can limit oxygen delivery to your scalp and hair follicles
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