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The estimated daily requirement needed to maintain body stores of B12 varies, an estimate being from 2µg to 5µg, more if stores have been depleted in any way. It is estimated that the average person stores about 1 mg (1000 µg) of B12 in their liver, and other smaller amounts elsewhere. The recommended daily allowance assumes a 50% absorption rate of ingested ...


7

Minim (unit): Part of the Apothecary system. It is rarely used anymore(some countries and areas still use the apothecary system) and is a alternative to the drop(which was formerly the smallest unit of the apothecary system). The minim (abbreviated min, ♏ or Mx, a symbol for minim in the apothecaries' system.svg) is a unit of volume in both the imperial ...


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Let me address this point mentioned in the question: "My apothecary person told me 500-1000 µg per day are needed to even start absorbing meaningful quantities by ingestion." This addresses a problem with the way we absorb vitamin B12. As explained here, when vitamin B12 is ingested, certain so-called transport proteins are needed to move it to the ...


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