Ingredients

Question

Have been referred to your website from Charles "Chucky" who raved about your site Please forgive me if my question was covered in one of the earlier Q&A's (tried to read them all before asking mine) Do manufacturers have to list "all" the ingredients for their products? Was under the impression that if less than 5% of a ingredient was used that a Manufacturer did not have to list? If so, how can one tell if a product is "truly kosher" ? Have u ever heard of such a tale? Thanks Ralph4king