
Lanolin is routinely used to make chewing gum. It's also used to prevent metal from rusting. It's a side product of sheep sheering, basically it's sheep sweat.
Castoreum is used in vanilla and raspberry ice cream. Sadly, it's listed as "natural flavoring;" not a very clear definition. It's basically beaver musk or beaver anal gland secretions.
L-Cysteine is a non-essential amino acid that can be synthesized by the body. It is used as a dough conditioner for breads. 80% is derived from duck feathers, leaving the other 20% to come from human hair, pigs' bristles and hooves.I was grossed out enough by those to make sure that I will double-down my efforts to read labels and to eat non-processed foods.
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