Description General description L-cysteine is a sulfur-containing non-essential amino acid. Its ability to reduce colitis symptoms is being assessed for potential use in treating inflammatory bowel disease (IBD). Naturally occurring non-essential amino acid. Application L-cysteine can be used as a cysteine source to prepare L-cysteine functionalized gold nanoparticles for use as probes in the colorimetric detection of Hg2+ in aqueous solution. Packaging 2.5 g in glass bottle 2.5 kg in poly bottle 25, 100, 500 g in poly bottle Biochem/physiol Actions NMDA glutamatergic receptor agonist.