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Plant foods don't have vitamin B12 unless they're fortified
One study found that even up to 2,000 micrograms a day of methylcobalamin wasnt enough to correct vitamin B12 deficiency in one of three vegans tested
For example, MTHFR gene variants and transcobalamin mutations can play a role
A 2005 study concluded that oral vitamin B12 and intramuscular (IM) vitamin B12 have similar effects in terms of normalizing serum vitamin B12 levels.(7) The treatment and maintenance of a B12 deficiency largely depends on what has caused it
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