Is it permissible to eat bread that contains L-Cysteine, extracted from human hair, at a proportion of less than 2%?

If it is proven that L-Cysteine is extracted from human hair, then it is impermissible to use it in the preparation of bread or any other food, and it is impermissible to eat bread made with it. This is out of respect for human beings and the sanctity of their parts, based on Allah's saying: "And We have certainly honored the children of Adam."