S-(2-Carboxyethyl)-L-cysteine (S-Carboxyethylcysteine) is a non-protein (modified) sulfur amino acid. S-(2-Carboxyethyl)-L-cysteine is present in Acacia seed. S-(2-Carboxyethyl)-L-cysteine can affect the seed's protein use in rats. S-(2-Carboxyethyl)-L-cysteine suppresses the methionine-induced growth rate, and has a negative effect on the plasma amino acid levels in rats[1].
S-(2-Carboxyethyl)-L-cysteine significantly increases the plasma urea level in rats[1].
[1]. Falade OS, et al. S-Carboxyethylcysteine (a constituent of Acacia seed) negatively affects casein protein utilization by rats. Nutrition. 2012 Jul;28(7-8):785-92.
















