Amino acids are in extreme short supply with Chinese producers prefering to sell in the mainland to avoid the difficulties of securing shipping. Mar 03, 2021 Last week was extremely volatile for the United States methionine market. On Thursday (February 25th), it was announced that the U.S. Department of Commerce set early anti-dumping duties up to 135% against foreign amino acid imports in a preliminary finding that Japan, France and Spain methionine producers were selling the product at below market prices. The deadline for deciding on these preliminary duties was postponed until the final moment, and a final determination is set to take place in May of 2021.