Was just watching the Dr. Oz show, and they spoke about this Natural Standard Professional Database. It's supposed to be an authority on integrative medicine. They have grading scales and evaluate studies on supplements.
There's a free log on, probably for one time use only. I just tried it and it worked, but I'm going out and didn't have time to browse around. If anyone wants to look something up or get some info, and you have time to check out the site, here's the log-in and password.
I was able to log in again on this site. When I first logged in, I checked the box to remember me, and the user and password was still there today. I clicked on the News tab, and was browsing some articles, interesting.