Vitamin B12 - cobalamin

B12 is a critical B vitamin involved in DNA synthesis and repair, detoxification, histamine metabolism, mitochondrial function, methylation, and many other processes in the body. Deficiency can lead to anemia, neurologic problems, and a number of other issues. B12 deficiency is relatively common, and certain groups are at significant risk. These include vegetarians, vegans, the elderly, and anyone with gut issues. B12 is found almost exclusively in animal foods, though is straightforward to supplement.