When you use Library Search to locate information on your topic, it will allow you to refine your search to ‘peer-reviewed journals’ using the filter under the Show only section (located on the left-hand menu).
Peer-reviewed items are indicated by the peer-reviewed icon displayed in the results:
If you have already found an journal article from a source other than Library Search, you can see if it comes from a peer reviewed journal by checking in Ulrich’s International Periodical Directory. Access Ulrich's by clicking on the Databases and electronic resources tab and select U in the databases by title list.
Once the database is open, type in the name of the journal you found the article in (eg: Women and Health). There will be a small symbol that looks like a soccer umpire's shirt (black and white striped) on the left hand side if that journal is peer reviewed.