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True fact: A common ingredient in commercial breads is derived from human hair harvested in China

"If you read the ingredients label on a loaf of bread, you will usually find an ingredient listed there as L-cysteine. This is a non-essential amino acid added to many baked goods as a dough conditioner in order to speed industrial processing. It's usually not added directly to flour intended for home use, but you'll find it throughout commercial breads such as pizza dough, bread rolls and pastries.

While some L-cysteine is directly synthesized in laboratories, most of it is extracted from a cheap and abundant natural protein source: human hair. The hair is dissolved in acid and L-cysteine is isolated through a chemical process, then packaged and shipped off to commercial bread producers. Besides human hair, other sources of L-cysteine include chicken feathers, duck feathers, cow horns and petroleum byproducts.

Most of the hair used to make L-cysteine is gathered from the floors of barbershops and hair salons in China, by the way."