Vitamin b12 is also known as
Pro Research Analysisby 
Searched over 200M research papers
Understanding Vitamin B12: Also Known as Cobalamin
Introduction to Vitamin B12 (Cobalamin)
Vitamin B12, also known as cobalamin, is a crucial water-soluble vitamin that plays a significant role in various physiological processes. It is essential for DNA synthesis, cellular metabolism, and the maintenance of the nervous system Green2017Hunt2014Brescoll2015. The term "cobalamin" is derived from the presence of cobalt within its molecular structure, which is integral to its biological activity Rizzo2019Butola2020.
Forms and Functions of Cobalamin
Cobalamin exists in several forms, including cyanocobalamin, hydroxocobalamin, methylcobalamin, and adenosylcobalamin. Each form has specific roles and bioavailability, with methylcobalamin and adenosylcobalamin being the active coenzyme forms in the human body Rakuša2022Zaman2023. These active forms are vital for the conversion of homocysteine to methionine and the isomerization of methylmalonyl-CoA to succinyl-CoA, processes crucial for DNA synthesis and energy production Hunt2014Rizzo2019.
Sources and Bioavailability of Vitamin B12
Humans primarily obtain vitamin B12 from animal-derived foods such as meat, eggs, milk, dairy products, fish, and poultry. It is absent in plant-based foods, making vegetarians and vegans particularly susceptible to deficiency unless they consume fortified foods or supplements Vincenti2021Butola2020. The bioavailability of B12 can be affected by various factors, including dietary intake, gastrointestinal health, and the presence of intrinsic factor, a protein necessary for B12 absorption in the ileum .
Clinical Manifestations of Vitamin B12 Deficiency
Vitamin B12 deficiency can lead to a range of clinical manifestations, including hematological symptoms like pernicious anemia and neurological symptoms such as sensory disturbances, ataxia, and psychiatric disorders Green20176. Dermatological manifestations, such as hyperpigmentation, hair and nail changes, and oral changes like glossitis, are also associated with B12 deficiency Brescoll2015Zaman2023. The deficiency can result from inadequate dietary intake, malabsorption, or disruptions in B12 transport and cellular uptake Green2017Vincenti2021.
Diagnostic Biomarkers and Management
Diagnosing B12 deficiency involves measuring serum B12 levels, holotranscobalamin, methylmalonic acid, and homocysteine levels. However, the exact cut-offs for clinical and subclinical deficiency remain debated Green2017Sobczyńska-Malefora2021. Management typically includes B12 supplementation through high-dose oral routes or parenteral administration, depending on the severity and underlying cause of the deficiency Green2017Hunt2014.
Conclusion
Vitamin B12, or cobalamin, is an essential nutrient with critical roles in DNA synthesis, cellular metabolism, and neurological function. Its deficiency can lead to significant health issues, highlighting the importance of adequate dietary intake and proper diagnostic measures. Understanding the various forms, sources, and clinical implications of B12 is crucial for preventing and managing deficiency effectively.
Sources and full results
Most relevant research papers on this topic