Yeast extract

Yeast extract is made by breaking down yeast cells, and that breakdown process generates histamine naturally.

• High biogenic amine content — as yeast cells are broken down during processing, the amino acid histidine is converted into histamine and other biogenic amines, leaving the extract highly concentrated with these compounds

• Widely used as a flavoring — yeast extract shows up in bouillon cubes, savory snacks, soups, and seasoning mixes, often labeled as "yeast extract" or hiding inside "natural flavors"

Reading ingredient labels on savory packaged foods is one of the more effective ways to reduce unintentional yeast extract intake.