healthfinder.gov. Offers an A-Z listing of health topics, a directory of organizations, a drug database and weekly newsletters on a variety of subjects. Produced by the Office of Disease Prevention and Health Promotion, in the U.S. Dept. of Health and Human Services.
MedlinePlus. This source from NIH and the U.S. National Library of Medicine offers dependable information on diseases, conditions and wellness. A medical dictionary is included.