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Yes, it is a fact that over 150 countries have imposed restrictions or bans on U.S. pork imports due to the use of ractopamine, a feed additive used to promote growth in livestock. Notably, the European Union and China are among the most prominent countries that have banned or restricted imports of pork from the U.S. because of concerns over ractopamine's safety for human consumption. Ractopamine is approved for use in the U.S. and some other countries, but many nations have raised health and safety concerns, leading to these import restrictions. The situation reflects broader issues related to food safety standards and regulatory differences between countries.