FDA-registered means they have their company name on file with the FDA and can claim FDA-registered status. Sorta like being able to say "Official vitamin of the World Cup" or something like that--a claim that's meant to be impressive but doesn't actually prove much. It still doesn't mean the FDA or anyone else tests their ingredients. Until the laws about dietary supplements change, which we're working on here in this country, none of that stuff gets any objective laboratory scrutiny. However, that Web site did say they'd done some effectiveness testing on that product, which is a claim they couldn't make unless it were true, and they have to have the results on record in order to make that claim. If you have the money to spend and want to try them, it probably wouldn't hurt to try that supplement. I'm not totally opposed to such things and have been known to try supplements myself; I'm just highly skeptical of most of their claims.