People buying certain fish oil supplements…are ingesting chemicals banned in 1979, according to environmental advocates who filed a lawsuit…Twinlab's chief science officer, Greg Grochoski, said the…cod liver oils tested…meet government standards…Stephen McCauley of public relations firm Porter Novelli responded for Pharmavite… saying its products comply with all federal laws…Scott Daniel, marketing communications manager at Now Foods, said the company has been investigating the concerns raised by environmental advocates for months...Solgar and GNC...did not respond immediately.