Children's Hospital of Philadelphia has banned dietary supplements from its pharmacy. That means kids won't get gingko biloba, melatonin, glucosamine, or mega-vitamins. Why? As Dr. Paul Offit (chair of the hospital's therapeutic standards committee) explained on my America Weekend show, those pills are not tested or regulated by the FDA, nor is there any scientific evidence that they help patients -- in fact, they're causing harm. Ironically, this week, the FDA proposed rules to make pet food safer, but these supplements continue to fill store shelves with no oversight.