Additionally, if your gastrointestinal tract does not function normally, as with celiac disease or Crohns disease, you may have trouble absorbing or releasing vitamin B12, which will affect the levels in your body and how long the vitamin stays there
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What is vitamin B12 and why does it matter
I know I have some degree of brain injury from the accident but I also think the B12 is not as potent as it once was
Ideally, blood tests (including full blood count, serum B12, folate, and possibly anti-intrinsic factor antibodies if pernicious anaemia is suspected) should be performed before starting supplements, as supplementation can affect test results
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