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...
Other
International Health News Database: Vitamin B12
At this website, there are several summaries of medical studies and clinical trials on vitamin B12 and its role in preventing and treating various health conditions. Read about vitamin B12's role in fighting such conditions as...
US National Library of Medicine
Medline Plus: Vitamin B12
This is a very brief write-up on vitamin B12, which is organized into several sections including, "Function," "Food Sources," and "Recommendations." Though not containing detailed information, this website serves as a good source of...