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Mayo Clinic is a non-profit medical practice about health awareness, information on diagnosis and treatment of almost any type of disease. The three basics on which mayo clinic stands upon are patient care, medical research, and academic education. It is the best source regarding health with the expertise of 3400 physicians and scientists.
Whatever you want to know about diseases, symptoms, tests and procedures, drugs and treatment, first aid, healthy lifestyle almost anything and everything regarding health information. One of its nicest feature is the Mayo Clinic Health Manager. Please check out and get a free E-Newsletter.
I recommend this site not just because I am writing a review on it but because I am a health care professional and everyday I use this site for my profession.