Good source for finding doctors anywhere in the United States

Cancer related information
Information on clinical trials for a wide range of diseases and conditions.

Disease Control and Prevention
Information about the programs that reduce the health and economic consequences of the leading causes of death and disability and ensure a long, productive, healthy life for all people.

Express Scripts
Provides information about drugs, drug images, and interaction with other drugs

Good source for parents and kids on various health related topics

HEALTHCARE.GOV: the Health Care Marketplace

Provides an evidence based information on herbs, botanicals, vitamins, and other supplements

HIV/AIDS Consumer Health Info
Provides access to the reliable links on the topic

HSRProj (Health Services Research Projects in Progress)
Information about ongoing health services, research, and public health projects.

Household Products Database
Health and safety information on household products.

Provides information about diseases and the respective tests.  It explains the test results.

Mayo Clinic
Health and medical information, news and self-improvement and disease management tools.

Authoritative health information on hundreds of diseases, conditions and health topics. This site also includes a medical encyclopedia, drug information, and links to recent article citations from the MEDLINE database.

National Institute of Health (NIH)
Consumer Health Information

National Library of Medicine
It collects materials in all major areas of the health sciences and to a lesser degree in such areas as chemistry, physics, botany and zoology.