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Pani G, Galeotti T, Chiarugi P
doi: 10.1152/jappl.1955.8.3.297
A serum B12 level below 200 pg/mL indicates deficiency, whereas values between 200-300 pg/mL suggest borderline status
Only when B12 injections became available was folate treatment abandoned, leaving many victims with irreversible B12-deficiency-related neurological damage
