why are b12 injections better than pills vs. Oral Supplements: Which Is Better? Vitamin B-12 Injections Vs Oral

The peptide is not damaged, only the concentration changed

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I also had iron deficiency anaemia at that time too which was corrected, and I also have non alcoholic liver disease so there could well be more than just B12 contributing here

It may be worth trying high dose oral/sublinguals in between injections - they can be effective for some patients - even those with PA - but don't help everyone

However, researchers must account for potential variability in absorption