Ключевые слова: analysis, analyzing, anemia, b12, blood, care, chemical, chemistry, cobalamin, concept, disease, epidemic, exam, experiment, health, healthy, hematology, hospital, illness, infection, lab, laboratory, malnutrition, medical, medicine, nutrient, nutrition, patient, research, sample, science, scientific experiment, supplement, supplementary, test, test tube, tube, virus, vitamin, vitamin b12, vitamins,