(L-Cysteine-15N,d3) Labelled L-Cysteine is used as radiolabeled internal standard. L-Cysteine is a non-essential amino acid that can be synthesized by the human body under normal physiological conditions if a sufficient quantity of methionine is available. L-Cysteine is commonly used as a precursor in the food and pharmaceutical industries. L-Cysteine is used as a processing aid for baking, as an additive in cigarett es, as well as in the preparation of meat flavours.
