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After he left hospital, John went to his GP with symptoms including joint pain

[16] Cyanocobalamin is also produced in the body (and then excreted via urine) after intravenous hydroxycobalamin is used to treat cyanide poisoning

This hereditary condition impedes the ileum (the final section of the small intestine) from effectively binding and transporting cobalamin into the bloodstream
acnes It is known that vitamin B12 is a regulator of its own biosynthesis pathway
