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Mayo Clinic — Comprehensive medical diagnosis and treatment; locations and services; request an appointment.

Vitamin D Council is a nonprofit organization whose mission is to increase public and professional awareness of the health benefits of vitamin D and to end the global epidemic of vitamin D deficiency.

The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world

The leading source for trustworthy and timely health and medical news and information. Providing credible health information, supportive community, and educational services by blending award-winning expertise in content, community services, expert co...

Simple and easy ways to naturally boost your Immune System Health and control chronic health problems. You CAN overcome chronic illness!

Health resources and personalized health tools. Information and news on depression, digestive health, diabetes, breast cancer, cardiovascular health, and much more.

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Trusted medical information to encourage healthy living. Enjoy free health tools and view detailed doctor-reviewed information about diseases, medical symptoms, treatments, drugs, and nutrition.

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Groundbreaking developments in science, space, technology, health, and the environment

Pet Health Information - PetMD is the largest website library of pet health information, including symptoms, diagnosis and treatment, with thousands of veterinarian written and approved articles.