Mayo Clinic offers award-winning medical and health information and tools for healthy living.

Men's health covers a range of topics, from sexual health and fitness to prostate cancer and erectile dysfunction. Find all you need and more from About.com Men's Health.

The eMedicine point-of-care clinical reference features up-to-date, searchable, peer-reviewed medical articles organized in specialty-focused textbooks, and is continuously updated with practice-changing evidence culled daily from the medical literature.

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The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world's largest medical library. 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. The collections stand at 5 million items--books, journals, technical reports, manuscripts, microfilms, photographs and images. Housed within the Library is one of the world's finest medical history collections of old (pre-1914) and rare medical texts, manuscripts, and incunabula.

Homepage of Merck.com, Merck's corporate Web site

Consumer Health News, Information and Resources Updated Daily - Consumer Health Information by HealthScout,Healthscout.com - get the latest health news. Features include mini-checkups, health library, medical search and more.

Extensive knowledge base of medical information on symptoms, diagnosis, and misdiagnosis of more than 20,000 medical conditions. Research causes of your symptoms or research treatments for diseases.