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CR5442

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At least with vit B12, it is a digestion issue, as we age, and apparently with interstinal/stomache/gallbladder issues, we don't break it out of food appropriately.

but with the supplement, on an empty stomach, our intestines can absorb tiny amounts of if.  Hence the large dose, 1000 mcg or more, for the 3 or so mcg absorbed

You can also take sublingual supplements or have shots, which would bypass the gut and solve the absorption problem.

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This study shows that both sublingual and oral supplementation are effective: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1884303/

It is talked about here: http://jacknorrisrd.com/sublingual-b12-no-better-than-just-swallowing/

But I think if you are talking about someone just diagnosed with full blown Celiac, taking supplements orally will not be effective, if they are not absorbing well or at all.

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2 problems with shots long term= they are usually cyanocabolamin (sp) rather than the methyl- variety. and they are doctor driven, ie, need a script for them, and docs can be stingy with it.  But short term, emergent, yup.

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