National Institutes of Health
Facts About Dietary Supplements: Vitamin B12
This website answers several questions about vitamin B12 such as, "What foods provide vitamin B12?" and "When is a deficiency of vitamin B12 likely to occur?" Here, you will also find information on the health conditions prevented and...
Precision Nutrition
Encyclopedia of Food: Vitamin B12 Cobalamin
An important vitamin to humans is vitamin B12. Find sources and benefits to the vitamin as well as potential trouble with deficiency or excess in the body.