Kosher certification is required to sell kosher food in the United States, Canada, and the UK. The reason for this is that food produced by companies that do not have a kosher certification is not safe for human consumption. This includes hard cheese, bread, and other dairy products. If a company wants to sell their product in the US, they need to be certified as kosher. In addition, many people enjoy kosher certified products because they are guaranteed to be free of bacteria and additives. Kosher certification is not just a religious requirement. It is a legal one as well.