I think it depends greatly on what you are seeking. I find good info on some of the sites like the NIH.gov, CDC.gov, American Lung Association for my lungs, Council on Aging, AARP for elder issues, etc.

For rare or "orphan" conditions, sometimes extra research is needed. Sites ending in .edu usually represent real research. It used to be that way for .org too, but that has been coopted so you need to be careful.

Even more important, in my opinion, is to look for published and peer-reviewed studies and information. Much of what we see from day to day on the Web as research is "sponsored" - another name for advertising, or "studies" that are nothing more than promotional literature for a specific pharmaceutical company, doctor's group, or company promoting their own latest product or service. This is also true in electronics, cars, appliances...but really scary if relied on for life or death decisions.

Sue