How can one know which brand of herbal supplements is best and most credible?!

How can one know which brand of herbal supplements is best and most credible?

I spend alot of money buying alot of herbal and nutritional supplements, but lately I've been wondering how one can know which supplements truly contain the ingredients that they claim in the amounts that they claim, and whether they are manufactured with quality standards, etc. Since they aren't regulated, how can one know for sure. Are there any brands that are frequently tested by independent labs, and how does one know that the supplement company is not just paying off the lab to give it a passing score? I'm obsessing over this but don't know how to find credible information about it. Can anyone help? Thank you.

Good question, because these products are essentially unregulated.
http://www.cfsan.fda.gov/~dms/ds-savvy.h...

Sometimes they are contaminated. Here's a list of supplement warnings and recalls from the FDA:
http://www.cfsan.fda.gov/~dms/ds-warn.ht...

This site claims to review supplements, but you need to suscribe. The NIH has a review of the site, but doesn't mention the accuracy of the testing.
http://www.consumerlab.com/
http://www.pubmedcentral.nih.gov/article...

Consumer Reports sometimes evaluates supplements, but I think this site also requires a subscription:
http://www.consumerreports.org/cro/healt...

I'd be interested to know about other third-party testing.