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22b.1.3 Absorption and metabolism For the transport into body cells, vitamin B12 is absorbed by either active absorption or passive diffusion
That is why tests like methylmalonic acid (4) tend to be much more accurate than serum B12 levels
I wish you well I respect your judgement over mine, but I haven't found any deterioration in ampoules that have been stored in the dark but are a year beyond their date
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Excellent sources include liver, oily fish (salmon, mackerel), meat, eggs, and dairy
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