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Warning: The Web holds a wide variety of information and misinformation, ranging from popular press coverage and advertisements to scholarly communications and grey literature. Be careful when using information from web sites, because it changes often which makes it hard to cite in a paper. The print equivalent is often preferred to electronic sources when citing because the print version is more reliable (it won't disappear as easily).
Always evaluate a web site before using it for research purposes.
Some criteria for evaluating web sites include (click here for more info):
You can always ask a librarian or your professor for an opinion about a specific site.
This lists a limited number of resources that meet the quality criteria for currency, credibility, & content. Major topics include: General Health, Women's Health, Men's Health, Parenting & Kids, Senior Health, Specific Health, For Health Professionals, Drug Information Resources, and other useful health sites.
Science.gov searches over 42 databases and over 2000 selected websites from 14 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results. It's a great place to look for governmental reports or research if you're not sure which agencies might be involved.