Yeast extract is the common name for yeast autolysates, that is, concentrations of yeast cells that are allowed to die and break up, so that the yeasts' digestive enzymes break their proteins down into simpler compounds.
Yeast autolysates are used in Vegemite, Marmite (and now Bovril), and Cenovis, spreads that are popular in Australia, the United Kingdom, and Switzerland respectively. Autolyzed yeast extract is also the primary source of monosodium glutamate for the food industry.
Yeast extract is not a natural source of vitamin B12, although many brands are fortified with B12. Those who seek to use such products as a main dietry B12 source (for example, vegans) should check the manufacturers nutritional information labelling.
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