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Then we pick an injection site, usually your upper arm or hip area
Vitamin B12 deficiency and nitrous oxide
If I understand rightly you haven't an absorption problem.So once on supplements or a richer B12 diet you can store and utilise b12 from your liver
However, some people have difficulty absorbing vitamin B12 from their diet, including dietary restrictions, certain medical conditions like pernicious anemia, or medications that interfere with B12 absorption
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