According to Boing Boing: Soy sauce can be made from human hair

Tracy says: “This article is about cheap soya sauce that is being manufactured in the East as an alternative to the original. The ‘secret ingrediant’ is amino acid syryp, a concoction consisting of ‘human hair … gathered from salon, barbershop and hospitals around the country’ which is then filtered to remove unhygenic matarials such as ‘… condom, used hospital cottons, used menstrual cycle pad, used syringe …’ The Chinese government has banned the production of this kind of soy sauce, although not the production of amino acid syryp.”

MMMMMMMM yum!