Quote:
Originally Posted by lurkingforacure
I have read that in general, B vitamins are poorly absorbed when taken orally. It helps to take them on an empty stomach. With regard to thiamine, I have also read that after 2.5mg, the body does not absorb it if taken orally:
T. E. Friedman, T. C. Kmieckiak, P. K. Keegan and B. B.
Sheft, “The Absorption, Destruction, and Excretion of
Orally Administered Thiamine by Human Subjects,”
Gastroenterology, Vol. 11, 1948, pp. 100-114.
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That appears to be correct regarding regular water soluble Thiamine. Mononitrate Thiamine is fat soluble so it's better absorbed into the brain. Of course even if its absorbed it may not be metabolized correctly by PWP. Need to look into this further.