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However, because B12 bound to haptocorrin is not metabolically active, use of only total serum B12 may result in Black patients being incorrectly identified as having a high B12 status

doi: 10.1007/s11010-013-1689-4 111 AssefaBMahmoudAMPfeifferAFHBirkenfeldALSprangerJArafatAM
Pentecost died on August 7, 1920, on a train trip to preach in Brooklyn

Food sources of vitamin B12 include beef, dairy, poultry, and fish