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doi:10.1111/j.1365-2133.2009.09216.x
Oral may make sense for a gut-first goal, while injections may be discussed for more body-wide goals
[1] These are exceedingly uncommon and possibly coincidental findings
Presented for research literature review only Devoto L (2008)
We will talk about this a little bit later, but it turns out that Vitamin B12 must go through several steps before it is properly absorbed through your GI tract and several hormone imbalances (including thyroid) can alter this absorption
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