Customs & Tariffs
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A licence is definitely needed, and it must be a "feed grade" license.
3 or 4 years ago numerous US exporters had "food grade" licenses, and were illegally exporting their product as food grade to extract a higher premium. My company was one of only three US companies that had the feed grade license in place. For almost three months we were one of the only companies who could get any whey permeate into China because of this registration.
Any reputable Chinese importer should be able to assist you in gaining one. The application is about 10 pages, and you will need someone to assist you because after the application comes numerous documents, seals, stamps, fees, and requirements - much of which needs to be translated into a Chinese dialect. It takes months to send in all the required information.
Additionally, you must register your products as feed vs. food as they are two completely different licenses. Unless you are very skilled in export, I would highly recommend you aquire the assistance of someone in an organization such as US Dairy Export Council to walk you through it - www.USDEC.org