They are used when oral iron supplements are ineffective or unpalatable, such as severe iron deficiency, malabsorption problems, or gastrointestinal diseases that prevent proper oral iron absorption
doi: 10.1146/annurev.nutr.24.012003.132306
National Library of Medicine Vitamin B12 level medlineplus.gov National Institutes of Health, Office of Dietary Supplements Vitamin B12: Fact Sheet for Health Professionals ods.od.nih.gov Cleveland Clinic Vitamin B12 Deficiency: Symptoms, Causes and Treatment my.clevelandclinic.org Nexo E, Parkner T Vitamin B12-Related Biomarkers Food and Nutrition Bulletin, 2024 doi.org/10.1177/03795721241227114 Harrington DJ, Stevenson E, Sobczynska-Malefora A The application and interpretation of laboratory biomarkers for the evaluation of vitamin B12 status Annals of Clinical Biochemistry, 2024 doi.org/10.1177/00045632241292432 Tufail N, et al Comparing Holotranscobalamin and Total Vitamin B12 in Diagnosing Vitamin B12 Deficiency in Megaloblastic Anemia Patients Cureus, 2024 consensus.app Mendonca GCC, et al B12 vitamin deficiency and dementia in the elderly Arquivos de Neuro-Psiquiatria, 2024 consensus.app Further reading Complete blood count: how to read your results How to read your blood test results Normal blood test ranges: a reference chart Vitamin B12 guide: benefits, sources and levels Vitamin D (25-OH): understanding your blood test A vitamin B12 result rarely tells its whole story on its own
doi: 10.3748/wjg.v29.i27.4289
