WebMD
WebMD provides valuable health information, tools for managing your health, and support to those who seek information. You can trust that our content is timely and credible.
Natural Medicines Database
The most authoritative resource available on dietary supplements, natural medicines, and complementary alternative and integrative therapies.
Merck Manual
From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world.
Medscape
Medscape from WebMD is a part of WebMD Health Professional Network that includes theHeart.org and eMedicine.com.
Clinical Key
ClinicalKey is a medical search engine and database tool owned by medical and scientific publishing company Elsevier that offers access to the medical library published by that company.
Epocrates Online
Epocrates, Inc. is an American company based in San Mateo, California that makes various mobile health software applications.