Vitamin B12 is a water-soluble vitamin, one of the eight-part B complex.
Also known as cobalamin, B12 is involved in cellular metabolism and formation of red blood cells (RBCs). It has an integral role in brain and nervous system function. B12 is made from intrinsic factor in the human stomach.
Chronic fatigue syndrome
- Tamura, J.; Kubota, K.; Murakami, H.; Sawamura, M.; Matsushima, T.; Tamura, T.; Saitoh, T.; Kurabayshi, H.; Naruse, T. (1999-04-01), "Immunomodulation by vitamin B12: augmentation of CD8+ T lymphocytes and natural killer (NK) cell activity in vitamin B12-deficient patients by methyl-B12 treatment", Clinical & Experimental Immunology, 116 (1): 28–32, ISSN 1365-2249, doi:10.1046/j.1365-2249.1999.00870.x, retrieved 2016-11-09