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People who may experience symptoms of B12 excess usually fall into one of these categories: Taking very high-dose supplements regularly Receiving frequent B12 injections without medical supervision Having underlying health conditions affecting vitamin metabolism Experiencing allergic reactions to B12 formulations possible symptoms of too much B12
Muscogiuri G, Altieri B, Annweiler C, Balercia G, Pal HB, Boucher BJ, Cannell JJ, Foresta C, Grbler MR, Kotsa K, Mascitelli L, Mrz W, Orio F, Pilz S, Tirabassi G, Colao A (2017) Vitamin D and chronic diseases: the current state of the art
Some are available over the counter, while others require a prescription
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