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At first, they get 1000 mcg every day for a week
Vitamin B 12 is needed to prevent anemia, since making porphyrin and heme in mitochondria for producing hemoglobin in red blood cells depends on succinyl-CoA made by vitamin B 12
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Oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less in people with gut absorption issues
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