The daily value RDA is based on studies done long ago.
The average absorbed from food is quite small daily... that is why intrinsic factor is needed to carry the cobalamin broken out from the protein eaten to the blood stream. Without instrinsic factor's action, only high doses of B12 can passively cross the GI membranes into the body. This is why empty stomach and intestine is best. Since everyone is different, absorption will vary from person to person.
Recommendations today are around 2.5micrograms a day, from animal based foods. eggs, dairy, meat and seafood.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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