Table of Contents
What are the Benefits of Vitamin B12?
Learn how Vitamin B12 supports red blood cell production, brain health, mood, energy, bone density, and heart health.

Updated
by Chrissy Rojas
Vitamin B12, also known as cobalamin, is an essential nutrient that plays a critical role in many bodily functions. It is vital for maintaining nerve health, producing DNA, and aiding in red blood cell formation. A deficiency in vitamin B12 can lead to various health issues, making it important to ensure adequate intake through diet or supplements. One shot of Ketone-IQ + Caffeine has 300% your Daily Value.
Red Blood Cell Formation
- A study found that vitamin B12 deficiency can lead to ineffective red blood cell formation, resulting in anemia (1).
- Another research article highlighted that supplementation with vitamin B12 significantly improves red blood cell counts in individuals with deficiency (2).
Brain Health
- Research indicates that low levels of vitamin B12 are associated with an increased risk of cognitive decline and dementia in older adults (3).
- A review of studies concluded that vitamin B12 supplementation could slow cognitive decline in individuals with mild cognitive impairment (4).
Energy Levels
- Studies show that individuals with vitamin B12 deficiency often experience fatigue and low energy levels, which improve with supplementation (5).
- Clinical trials have demonstrated that vitamin B12 supplementation can reduce fatigue in those with deficiency (6).
Bone Health
- Research has shown a correlation between low vitamin B12 levels and decreased bone mineral density, leading to osteoporosis (7).
- Supplementation with vitamin B12 has been associated with improved bone health (8).
Mood
- Vitamin B12 plays a role in the synthesis of serotonin, a neurotransmitter that affects mood. Deficiency Vitamin B12 has been linked to an increased risk of depression. (9)
- Clinical evidence suggests that vitamin B12 supplementation can improve depressive symptoms, particularly in those with a deficiency (10).
Heart Health
- Research indicates that high homocysteine levels are associated with an increased risk of cardiovascular diseases, and vitamin B12 helps lower these levels (11 ,12)
References
- Stabler, S. P., & Allen, R. H. (2004). Vitamin B12 deficiency as a worldwide problem. Annual review of nutrition, 24, 299–326. https://doi.org/10.1146/annurev.nutr.24.012003.132440
- Green, R., & Miller, J. W. (2022). Vitamin B12 deficiency. Vitamins and hormones, 119, 405–439. https://doi.org/10.1016/bs.vh.2022.02.003
- Smith, A. D., Warren, M. J., & Refsum, H. (2018). Vitamin B
. Advances in food and nutrition research, 83, 215–279. https://doi.org/10.1016/bs.afnr.2017.11.005 - Moore, E., Mander, A., Ames, D., Carne, R., Sanders, K., & Watters, D. (2012). Cognitive impairment and vitamin B12: a review. International psychogeriatrics, 24(4), 541–556. https://doi.org/10.1017/S1041610211002511
- Allen L. H. (2009). How common is vitamin B-12 deficiency?. The American journal of clinical nutrition, 89(2), 693S–6S. https://doi.org/10.3945/ajcn.2008.26947A
- Obeid R, Andrès E, Češka R, Hooshmand B, Guéant-Rodriguez R-M, Prada GI, Sławek J, Traykov L, Ta Van B, Várkonyi T, et al. Diagnosis, Treatment and Long-Term Management of Vitamin B12 Deficiency in Adults: A Delphi Expert Consensus. Journal of Clinical Medicine. 2024; 13(8):2176. https://doi.org/10.3390/jcm13082176
- Tucker, K. L., Hannan, M. T., Qiao, N., Jacques, P. F., Selhub, J., Cupples, L. A., & Kiel, D. P. (2005). Low plasma vitamin B12 is associated with lower BMD: the Framingham Osteoporosis Study. Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research, 20(1), 152–158. https://doi.org/10.1359/JBMR.041018
- Dai, Z., & Koh, W. P. (2015). B-vitamins and bone health--a review of the current evidence. Nutrients, 7(5), 3322–3346. https://doi.org/10.3390/nu7053322
- Tiemeier, H., van Tuijl, H. R., Hofman, A., Meijer, J., Kiliaan, A. J., & Breteler, M. M. (2002). Vitamin B12, folate, and homocysteine in depression: the Rotterdam Study. The American journal of psychiatry, 159(12), 2099–2101. https://doi.org/10.1176/appi.ajp.159.12.2099
- Almeida, O. P., Ford, A. H., Hirani, V., Singh, V., vanBockxmeer, F. M., McCaul, K., & Flicker, L. (2014). B vitamins to enhance treatment response to antidepressants in middle-aged and older adults: results from the B-VITAGE randomised, double-blind, placebo-controlled trial. The British journal of psychiatry : the journal of mental science, 205(6), 450–457. https://doi.org/10.1192/bjp.bp.114.145177
- Homocysteine Studies Collaboration (2002). Homocysteine and risk of ischemic heart disease and stroke: a meta-analysis. JAMA, 288(16), 2015–2022. https://doi.org/10.1001/jama.288.16.2015
- Wald, D. S., Law, M., & Morris, J. K. (2002). Homocysteine and cardiovascular disease: evidence on causality from a meta-analysis. BMJ (Clinical research ed.), 325(7374), 1202. https://doi.org/10.1136/bmj.325.7374.1202
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