What is L-cysteine/cysteine/cystine?

We reported the human and animal origins of L-cysteine in The Vegetarian Resource Group's Dictionary of Food Ingredients ten years ago. Then, the most common source was human hair found on the floors of Chinese barbershops. Today, it is derived from Chinese duck feathers approximately 80% of the time (estimation based on values given by several companies that manufacture and sell L-cysteine).

At least two forms of synthetic L-cysteine that were not readily available in 1997 when we first reported on L-cysteine are manufactured today. They are produced by Ajinomoto and Wacker Biochem. Ajinomoto ... more.

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