Best Bet
The National Library of Medicine (NLM) journal citation database includes citations from over 5,200 scholarly journals from around the world. These journals are carefully vetted prior to inclusion in the database. Records date back to 1946. Topics include medicine, nursing, dentistry, veterinary medicine, the health care system, and related topics.
MEDLINE is also included within the PubMed database. This EBSCO-based version is great for people familiar with EBSCO functionality. It also provides access to saved searches, MeSH trees, and a MeSH search generator.