Methylcobalamin and cyanocobalamin are two different forms of vitamin B12 ... differ in structure—methylcobalamin contains a ...

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

People who sit on the low or high side of normal vitamin B12 levels are still at risk of cognitive impairment, according to a ...

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

Dear Doctors: I was surprised when a blood test at my annual checkup found I’m low in B vitamins, especially B12. My doctor gave me a shot, and the fatigue that I had been feeling went away. Why is ...