L-Cysteine – is made from Human Hair, Feathers and Pig Hair & hooves
Human hair – L-Cysteine is an amino acid used to prolong shelf-life in products such as commercial bread.
It can be found in duck and chicken feathers and cow horns but the one used in food comes mostly from human hair.
Hoax or Fact Confirmed

L-Cysteine, often relabelled as “Amino Acid”
Used in Commercial Bread, Doughnut’s, Pizza, Burger outlets like McDonald and Burger King
Most of the hair used for L-Cysteine production comes from China where it’s gathered from barbershops and hair salons. L-Cysteine is not an additive in flour so you can avoid its consumption by buying fresh bread from a local baker. Fast food places such as McDonald’s, Dunkin’ Donuts and Burger King also use L-Cysteine as an additive.
Fast Food Chains
The Vegetarian Resource Group (vrg.org) inquired some of the major fast food chains about concerns on this food additive L-Cysteine. According to it, McDonald’s L-Cysteine is derived from duck feathers and is present in their Honey Wheat Roll, the Deluxe Warm Cinnamon Roll, and the Baked Apple Pie. The L-Cysteine in many products at Dunkin’ Donuts is also derived from duck feathers. In June 2007, Burger King said they “could not guarantee” the source of L-Cysteine in its products.

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