One of these essential vitamins is vitamin B—especially B12, which we often get from eating meat, fish, seafood, eggs, and dairy. However, it's possible to miss the mark with your recommended intake. ...

If you’re always feeling tired, even after a full night’s sleep, it could be a sign you need more Vitamin D. Aching in your bones or back pain can be a sneaky hint that your body wants more ...

People with kidney disease may also experience a buildup of cyanide in their body due to the formulation of B12 cyanocobalamin, a synthetic form of B12 found in some vitamin B supplements.

Reizenstein, P. G., Acta Med. Scand., 165 (1959). Adams, J. F., Vitamin B 12 and Intrinsic Factor; Second European Symp., Hamburg, 628 (1962). Glass, G. B. J., J. Lab ...