Two cases of vitamin B12 deficiency in patients with beta thalassemia trait: lessons in diagnosis Bulletin of the National Research Centre Springer Nature Link Thalassemia: High Yield Notes Inherited microcytic anemia ( globin chain production) severity varies from trait (mild) to major (severe) Key Concept Microcytosis from reduced hemoglobin synthesis Trait often mild asymptomatic; Cyanocobalamin (B12) Injection 1000 mcg mL, Multiple Dose Vial 30 mL McGuff thalassemia risk and prenatal testing My DNA is bad. B12 Thalassemia: The Amazing Benefit For Energy Liv Hospital