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What Is Vitamin B12?

Vitamin B12, also referred to as cobalamin, is a water-soluble vitamin. Studies have established that it is necessary for the production of red blood cells, DNA synthesis, and neurological health. It contributes to energy metabolism by promoting the breakdown of fats and proteins. It also supports the myelin sheath, a protective covering that shields nerves from damage.

Vitamin B12 is found naturally only in animal products, including meat, fish, eggs and dairy. It is also available in fortified plant-based sources and supplements.

Vitamin B12 deficiency is widespread among vegans, older individuals and those suffering from absorption problems. This can cause health problems such as fatigue, memory issues and nerve damage. It has also been linked to neurological disease, anaemia, energy metabolism and mental health, further emphasising the importance of it for overall endocrine status.

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How Does Vitamin B12 Work?

Vitamin B12 acts as a coenzyme in essential metabolic pathways. It helps convert homocysteine to methionine, a reaction required for DNA synthesis and one that also transfers a methyl group to adapt gene expression. B12 also forms succinyl-CoA, part of the Krebs cycle and energy production.

In the nervous system, it surrounds nerve fibres and allows for optimal transmission of signals. A lack of B12 disrupts these pathways, causing problems such as faulty DNA synthesis, high homocysteine levels, anaemia and loss of nerve cell insulation. Its diverse functions justify its importance in biomedical studies.

Research on Vitamin B12?

Essential for Red Blood Cell Formation: Research has shown that vitamin B12 is essential for red blood cell (RBC) formation, playing a critical role in DNA synthesis during erythropoiesis. Erythroblasts require B12 for proliferation and differentiation; its deficiency impairs DNA synthesis, leading to erythroblast apoptosis and ineffective erythropoiesis, resulting in anaemia [1].

B12 deficiency, caused by inadequate intake, malabsorption, or disrupted transport, is common in populations with restricted animal-derived food intake. Supplementation, either oral or parenteral, effectively restores B12 levels, supporting healthy RBC production and preventing anaemia [2].

Supports Nervous System Health: Research indicates that Vitamin B12 is vital for nervous system health, contributing to myelin synthesis, neurotransmitter production, and cellular energy processes. Alongside vitamins B1 and B6, B12 exhibits neuroprotective and antioxidative effects, supporting both the central and peripheral nervous systems.

Studies have shown that a deficiency in B12 can lead to neurological disorders, but supplementation, even without proven deficiency, has shown benefits in conditions like peripheral neuropathy. Its synergistic role with other B vitamins highlights its importance in maintaining neurological function [3].

Required for DNA Synthesis and Cell Division: Research suggests that Vitamin B12 is essential for DNA synthesis and cell division. It acts as a cofactor for enzymes like methionine synthase and methylmalonyl-CoA mutase, which are critical for nucleotide synthesis and DNA methylation [4].

Its deficiency leads to impaired DNA replication, genetic instability, and cell cycle arrest, particularly in rapidly dividing cells. B12 also protects DNA from oxidative damage through its antioxidant properties. Research highlights its therapeutic potential, including as a target for anti-glioma treatments via cobalamin transport antagonists [5].

Reduces Homocysteine (Cardiovascular Support): Vitamin B12 studies have shown that it plays a key role in reducing homocysteine levels, which are associated with an increased risk of cardiovascular diseases like stroke and coronary artery disease.

By acting as a cofactor in homocysteine metabolism, B12 helps convert it into methionine, thereby lowering its concentration [6]. While studies suggest that B-vitamin therapy, including B12, may reduce stroke risk, particularly ischemic and subarachnoid hemorrhages, clinical trial results remain inconsistent, warranting further research into its cardiovascular benefits [7]. 

Energy Metabolism: Vitamin B12 is essential for energy metabolism, supporting mitochondrial function and cellular energy production. It acts as a cofactor in metabolic pathways, aiding in DNA synthesis and methylation. Deficiency in B12 disrupts these processes, leading to reduced energy production and potential neurological or cardiovascular complications.

Early diagnosis of B12 deficiency is challenging due to delayed clinical symptoms, but understanding its metabolic pathways and associated proteins is crucial for effective diagnosis, treatment, and maintaining energy balance [8].

Supports Mood, Cognition, and Mental Health: Studies have shown that Vitamin B12 supports mood, cognition, and mental health by maintaining myelin integrity, neurotransmitter synthesis, and homocysteine metabolism. Its deficiency can lead to neurotoxic effects, including oxidative stress, vascular damage, and neurodegeneration, contributing to cognitive decline and mental health issues.

While supplementation may not significantly improve cognitive function or depressive symptoms in individuals without overt deficiency, proactive measures like early screening and supplementation in high-risk groups, such as the elderly, can help prevent deficiency-related cognitive impairments.

Supports Pregnancy and Fetal Development: Vitamin B12 is crucial for pregnancy and fetal development, supporting DNA synthesis, myelination, and methylation processes. It plays a vital role in placental development, ensuring proper nutrient transfer to the fetus.

B12 deficiency can impair placental function, increase inflammation, and affect docosahexaenoic acid levels, potentially impacting maternal and fetal health. Adequate B12 levels during pregnancy are essential for healthy fetal growth, emphasising the importance of monitoring and addressing maternal B12 status.

Immune System Support: Research suggests that Vitamin B12 supports the immune system by balancing immune responses, aiding in the fight against viral infections, including COVID-19.

Supplementation with forms like methylcobalamin and cyanocobalamin has been shown to reduce homocysteine and methylmalonic acid levels, alleviating symptoms such as pain, memory loss, and impaired concentration.

While promising, further research is needed to optimize B12 dosing, forms, and administration for tailored immune support in both COVID-19 and general health contexts [12].

References

[1] M J Koury and P Ponka (2004) New insights into erythropoiesis: the roles of folate, vitamin B12, and iron – Annual Review of Nutrition, 2004, Volume 24, Pages 105-31. 

[2] R Green, L H. Allen, A-L Bjørke-Monsen, et al (2017) Vitamin B12 deficiency – Nature Reviews Disease Primers volume 3, Article number: 17040 (2017).

[3] C A Calderón‐Ospina and M O Nava‐Mesa (2019) B Vitamins in the nervous system: Current knowledge of the biochemical modes of action and synergies of thiamine, pyridoxine, and cobalamin – CNS Neuroscience Therapy, 2019 Sep 6, Volume 26 (Issue 1), Pages 5–13.

[4] K Halczuk, J Kaźmierczak-Barańska, B T Karwowski, et al (2023) Vitamin B12—Multifaceted In Vivo Functions and In Vitro Applications – Nutrients, 2023 Jun 13, Volume 15 (Issue 12), Page 2734.

[5] Z Rzepka, J Rok, M Maszczyk, et al (2021) Response of Human Glioblastoma Cells to Vitamin B12 Deficiency: A Study Using the Non-Toxic Cobalamin Antagonist – Biology (Basel), 2021 Jan 19, Volume 10 (Issue 1), Page 69.

[6] S Yuan, A M Mason, P Carter, et al (2021) Homocysteine, B vitamins, and cardiovascular disease: a Mendelian randomization study – BMC Medicine, 2021 Apr 23, Volume 19, Page 97.

[7] G Ntaios, C Savopoulos, D Grekas, et al (2009) The controversial role of B-vitamins in cardiovascular risk: An updateRôle controversé des vitamines B sur le risque cardiovasculaire : mise au point – Archives of Cardiovascular Diseases, Volume 102, Issue 12, December 2009, Pages 847-854.

[8] P Mucha, F Kus, D Cysewski, et al (2024) Vitamin B12 Metabolism: A Network of Multi-Protein Mediated Processes – Int J Mol Sci, 2024 Jul 23, Volume 25 (Issue 15), Page 8021.

[9] S Markun, I Gravestock, L Jäger, et al (2021) Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue: A Systematic Review, Meta-Analysis, and Meta-Regression – Nutrients, 2021 Mar 12, Volume 13 (Issue 3), Page 923.

[10] M Umekar, T Premchandani, A Tatode, et al (2025)  Vitamin B12 deficiency and cognitive impairment: A comprehensive review of neurological impact – Brain Disorders, Volume 18, June 2025, 100220.

[11] A Arcot, R E Walker, K Gallagher, et al (2024) Maternal Vitamin B12 in Pregnancy and Placental Development – Journal of Nutrition & Metabolism, 2024 Aug 8, 2024:3439995.

[12] K S Batista, V M Cintra, P A F Lucena, et al (2022) The role of vitamin B12 in viral infections: a comprehensive review of its relationship with the muscle-gut-brain axis and implications for SARS-CoV-2 infection – Nutrition Reviews,  2022 Feb 10, Volume 80 (Issue 3), Pages 561-578. 

Vitamin B12 FAQ's

The answers to the most frequently asked questions about Vitamin B12.

Vitamin B12 FAQs
Where can I buy Vitamin B12 Nasal Spray?

Buy Vitamin B12 nasal spray from Peptide Works, available for research use only. It is designed to support laboratory studies on vitamin delivery and absorption efficiency. This product has not been reviewed or approved by the U.S. Food and Drug Administration (FDA) and is not intended for human or medical use. Each batch is produced with high purity and consistency to ensure reliable performance in scientific research. 

What are the Symptoms of Vitamin B12 Deficiency?

Vitamin B12 deficiency causes tiredness, weakness, and light-headedness. It can lead to pale skin, tingling in hands or feet, poor memory, and mood changes. The tongue may become sore or red. These signs appear when the body lacks enough B12 to make healthy blood and nerve cells. Detecting and treating low B12 early helps prevent long-term health problems.

Does Vitamin B12 Nasal Spray Absorb Better than a Pill/ Tablet?

Vitamin B12 nasal spray often absorbs better than pills or tablets. The spray goes through the nose lining and enters the bloodstream directly. Pills must pass through the stomach and intestines, where some B12 may not absorb well. The nasal route can deliver B12 faster and more evenly, which makes it a good option for research on absorption and delivery methods.

What are the Side Effects of Vitamin B12 Nasal Spray? 

Vitamin B12 nasal spray can sometimes cause slight nasal irritation, sneezing, or a mild runny nose during testing. Occasional headache or light dizziness may also appear. These effects are short-lived and usually settle without adjustment. The spray is formulated for controlled experimental study, allowing accurate observation of vitamin delivery and absorption performance. 

What is the Difference Between Vitamin B12 and Iron Deficiency?

Vitamin B12 and iron deficiencies share some symptoms, like fatigue, but they are not the same. B12 deficiency typically results from poor absorption, or a lack in the diet, for example, among vegans. This can cause large red blood cells and neurological issues. Iron deficiency, on the other hand, occurs when too little iron is ingested or lost through the blood, and as a result, there will be small red blood cells, pale skin, and weak fingernails. Most deficiencies, such as B12, are treated with supplements or injections; iron deficiency is generally managed by taking iron supplements and, in some cases, finding the cause of the blood loss. Correct diagnosis is crucial for appropriate therapy.

Additional Reading
Vitamin B12 for Brain Function

How Does Vitamin B12 for Brain Function Complement BDNF Peptides, Selank and Semax?

This blog explores how Vitamin B12 supports brain function alongside BDNF, Selank and Semax in research. It highlights Vitamin B12’s role in neural stability and energy metabolism, BDNF’s influence on plasticity, and the peptide actions of Selank and Semax on mood and learning together illustrating complementary mechanisms of cognitive support.

Vitamin B12 Immune System Support

Can Vitamin B12 Immune System Support Enhance the Effects of Thymosin Alpha-1?

This blog looks at how Vitamin B12 and Thymosin Alpha-1 each support immune health through different yet complementary actions. It explains B12’s part in DNA formation, lymphocyte growth, and T cell balance, while Thymosin Alpha-1 helps activate dendritic cells and guide cytokine signaling. Together, they may offer new insights for future immune system research.

Immunity Peptides

Immunity Peptides from Peptide Works

This blog explores the fascinating world of immunity peptides small chains of amino acids that play a vital role in immune system function. From Thymosin Alpha-1 to LL-37 and VIP, discover how these compounds enhance immune defenses, regulate inflammation and support balance. Peptide Works empowers researchers with high-quality peptides for groundbreaking discoveries.

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