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Most patients begin noticing changes within 46 weeks, with more visible results after 812 weeks
Additional tests may include full blood count (to check for macrocytic anaemia), methylmalonic acid and homocysteine levels (which rise in B12 deficiency), and tests for intrinsic factor antibodies if pernicious anaemia is suspected
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If you have questions about side effects, call your doctor
How quickly do Vitamin B12 injections work
This is especially true for things you are injecting directly into your body verses oral medications
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