GMedical
The Merck Manual of Diagnosis and Treatment A well known and well respected source of information for the health professional.
Doctor's Guide to the Internet A very useful site, free registration.
MDChoice A great site for health professionals as well as consumers.
RXList The Internet Drug Index
Natural Medicine Comprehensive DataBase
Normal Lab Values
Your Disease Risk
MayoClinic A good source of disease and drug information
USPharmacist
Quackwatch
One A.D.D. Place Help with diagnosis of ADHD and ADD in children and adults.
Realage.com Find out if your real age is the same age as you are health-wise.
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