US National Library of Medicine
Medline Plus: Pernicious Anemia
This site contains details of pernicious anemia, alternative names, definition, causes and risks, prevention, symptoms, signs and tests, treatment, and complications. It also includes a picture of pernicious anemic red blood cells.
Mayo Clinic
Mayo Clinic: Vitamin B12
In addition to providing information on the functions and food sources of vitamin B12, this website includes a chart of usage and dosage.
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...
Other
Cancerlinks: Possible Causes of Stomach Cancer
This write-up, with information taken from the National Cancer Institute, explores possible causes of stomach cancer.