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how often b12 injections vegan Benefits Of B-12 For Vegans & Vegetarians Vitamin B12 Injection Dosage |
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B12 absorption requires a protein called intrinsic factor , produced in the stomach

Using this compound as a marker of cobalamin deficiency, we have been able to demonstrate that cats and dogs with very low serum cobalamin do indeed have a significant tissue-level cobalamin deficiency (Figure 2)

doi: 10.1210/jc.2003-030151

Diagnosis and classification of pernicious anemia
