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For individuals with healthy absorption who need modest B12 supplementation, oral forms may adequately maintain levels at minimal expense
Per MedlinePlus, the following conditions can inhibit your body from absorbing enough vitamin B12: Excessive alcohol use Crohns disease Celiac disease Pernicious anemia Digestive disorders Fish tapeworm infection Surgeries that remove certain parts of your stomach or small intestine Long-term use of antacids and other heartburn medicines can also cause vitamin B12 deficiency
However, as people age, their metabolism slows, potentially leading to higher BAC levels for the same amount of alcohol consumption
On top of that, we know that only a small percentage of vitamin B12 taken orally is actually absorbed