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Natural Amino Acids. An amino acid found in several of the proteins in the body, including many digestive enzymes, L-Cysteine is involved in important bodily functions. L-Cysteine is also one of the bodys chief sources of sulfur. Amino acids are considered the building blocks of protein and are essential for a variety of biological processes. Available in (500 mg) capsules. ** These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.