Feed additive tracker: Amino acid prices easing, markets await lysine expansion projects Prices for amino acids including lysine, threonine and tryptophan are showing a slight downward trend from the record-highs of late, according to data from Swiss trading and data platform, Kemiex. Vitamin pricing is diverse with markets mostly following the course of vitamins A, C and E. The US dollar has been strengthening against China’s yuan, offering a short-term relief for US dollar-denominated buyers, said Stefan Schmidinger, partner at Kemiex. The yuan logged its worst month since August 2019 in March, according to Reuters, as expectations of a quick US economic recovery and rising US Treasury yields have buoyed the dollar.