The Department of Commerce's International Trade Administration (ITC) said it would collect a 52 per cent anti-dumping duty on China-sourced monosodium glutamate.
MSG is used in many prepared foods to boost taste, and because it is widely found in Asian foods, it is often blamed for after-meal aches called Chinese Restaurant Syndrome.
The decision today hits trade that amounted to 26,600 tonnes of MSG bought from China last year, worth USD 33.5 million.
Two Chinese producer-exporters were singled out in the complaint: the Meihua Group and Shandong Linghua Monosodium Glutamate Inc.
The ITC also hit Indonesian MSG exporters, and specifically PT Cheil Jedang indonesia, with a 5.6 per cent anti-dumping duty. Indonesia shipped 4,500 tonnes of MSG to the United States last year, worth USD 6 million.
The ITC decision is preliminary; a final ruling will be made in November.