Vitamin B12: Only About 2% Of A 500 Microgram Dose Gets Absorbed

From: How I Treat Cobalamin (Vitamin B12) Deficiency, Ralph Carmel, Blood, September 2008

Note that as the amount of vitamin B12 injested goes up, the amount absorbed goes down. Wayyyy down. Only about 2% of a 500 microgram dose gets absorbed.

PA = Pernicious Anemia. The stomach fails to make enough intrinsic factor needed for B12 absorption.


Individual variation is wide, both in normal persons and patients with malabsorption.

1 thought on “Vitamin B12: Only About 2% Of A 500 Microgram Dose Gets Absorbed

  1. alphaandomega21


    Many thanks for this. The rate of absorbtion depends on the fauna in the gut. The bacteria are largely responsible I understand for the bringing of food into the body via the intestines. If these are not functioning properly due to neuro-toxicity from most medications and such things as glyphosate residues then we have a problem.

    Kind regards

    Baldmichael Theresoluteprotector’sson



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