I did not know this, but today I was sent a link to an article that talked about how the Chinese and the Japanese used human hair for the production of soy-sauce. Further, the article said that the amino acid that was present in human hair provided an alternative to soy beans in giving soy sauce its flavor. What makes it dangerous is that the chemicals used to extract these amino acids are carcinogenic. While the Japanese used this method during the World War II because of soybean shortage (because of food shortages, soybean was consumed as soybean, instead of being used to make soy sauce), they stop the practice some time ago. The Japanese put a ban on the production of soy sauce from anything other than organic proteins. The Chinese soy sauce manufacturer, on the other hand, saw the use of human hair as a cheaper alternative to using real soybeans. For full view of the article, click HERE.