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But a huge number of meat eaters are also deficient and likely dont know it B12 is absorbed through the stomach, and our ability to assimilate it through the stomach wall decreases with age, as well as due to any stomach issues like IBS, Crohns, and Celiac Disease, and medications that impact the stomach like metformin, antacids, PPIs, and ibuprofen

And its not convenient anyway

7 signs and symptoms of vitamin b12 deficiency These are some of the most common symptoms of vitamin b12 deficiency

Vitamin B12 requires stomach acid and a protein called intrinsic factor to be absorbed properly

The same mcg dose can equal different units when the mixing ratio changes

your starting point matters