A study found that B12 requirements may be too low for some people, putting them at risk for cognitive decline.

Allergic reactions to vitamin B12 are rare, but real. The reason may sound strange, but it's true - an allergy to cobalt.

The studies focused on corrinoids, the vitamin B12 family of nutrients ... The second study investigated corrinoids in soils. Chemical analysis revealed that soils contain corrinoids at levels ...