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But this is a convenience preference, not a chemical necessity
doi: 10.1016/bs.vh.2016.04.005
PMID 8154512.
Pharmacological Reviews, 59(2), 151184
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Vitamin B12 deficiency is believed to be one of the most common nutrient deficiencies in the world, especially among people taking stomach acid-altering medications and antibiotics frequently, along with the elderly and sometimes vegetarians/vegans
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