According to this UK site, "enzymes" (which are an iffy ingredient for us) may be used but are not legally required to be listed because they are "burned off" in the baking process:
Enzymes are modern baking's big secret. A loophole classifies them as 'processing aids', which need not be declared on product labels. Additives, on the other hand, must be listed. Not surprisingly, most people have no idea that their bread contains added enzymes.
An enzyme is a protein that speeds up a metabolic reaction, and are extracted from plant, animal, fungal and bacterial sources...
A whole host of enzymes are used in baking. Their status as processing aids is based on the assumption that they are 'used up' in the production process and are therefore not really present in the final product. This is a deception that allows the food industry to manipulate what we eat without telling us...
Manufacturers have developed enzymes with two main objectives: to make dough hold more gas (making lighter bread) and to make bread stay softer for longer after baking. Many bakery enzymes are derived from substances that are not part of a normal human diet. Even if such enzymes are chemically the same as some of those naturally found in flour or bread dough, they are added in larger amounts than would ever be encountered in ordinary bread.
And now the safety of bakery enzymes has been radically challenged by the discovery that the enzyme transglutaminase, used to make dough stretchier in croissants and some breads, may turn part of the wheat protein toxic to people with a severe gluten intolerance. This development is important because it suggests that adding enzymes to bread dough may have unintended and damaging consequences. Surely no one can seriously suggest that bakery enzymes should be omitted from bread labels.
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