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In women with confirmed deficiency, milk levels are typically less than 100 pmol/L (135 ng/L).[9,12,39] A lower milk level threshold of 310 pmol/L (420 ng/L) for adequate infant B 12 intake has been suggested.[28] Three mothers in India with vitamin B 12 deficiency due to very low dietary intake were given a single 50 mcg intramuscular injection of vitamin B 12

In summary, accurate assessment of vitamin B12 status is problematic, and there is no consensus as to the best biomarker or combination of biomarkers to use

The symptoms experienced by patients with Long COVID are almost identical to those of Vitamin B12 Deficiency

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