Pyridoxine (vitamin B6) is necessary for synthesis of D-aminolevulinic acid, a precursor of heme. Pyridoxine-deficient patients develop anemia with microcytic-hypochromic RBCs that can simulate chronic iron deficiency. Both hereditary and acquired (secondary) forms exist. The hereditary form is rare and the acquired form is uncommon, with the most frequently mentioned secondary type being due to […]