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A person who ingests too much vitamin D may feel nauseated, weak and lose their appetite
So, if your vitamin B12 deficiency is due to an autoimmune disease in which your stomach doesn't make intrinsic factor, supplements might not work for you, and you will need injections
Insider's takeaway Vitamin B12 injections are for those with a severe B12 deficiency or conditions that prevent their body from effectively absorbing the vitamin, Moreno says
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The form of B12, how it is paired, and how it is prescribed can significantly influence how your body responds
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