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Any GI sensitivity
[17] Physiologic B12 requirements increase during gestation, and parenteral cyanocobalamin is considered appropriate when dietary intake or intestinal absorption is inadequate
4.1 Limitations and implications for practice This meta-analysis has several limitations that should be considered when interpreting the findings
[2] [4] Animals require B 12 but plants do not, relying instead on alternative enzymatic pathways
The vitamin B12 coenzymes are very unstable in light
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