# Yeast extract
**Yeast extract** is the water-soluble concentrate of the soluble fraction of yeast cells, principally *Saccharomyces cerevisiae*, obtained after the cell membrane is disrupted and the cell contents are released and partly broken down into amino acids, peptides, carbohydrates, and salts. It is used in food chiefly as a flavoring agent providing umami and related savory tastes, and it is also used as a nutritional ingredient, a microbial fermentation medium, an animal feed additive, and a cosmetic supplement.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) • [2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) • [3](https://doi.usp.org/USPFCC/FCC_F100649_03_01.html)
| Key fact | Detail |
|---|---|
| Definition | Water-soluble components of the yeast cell, primarily amino acids, peptides, carbohydrates, and salts, released after disruption of the yeast cell[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) • [3](https://doi.usp.org/USPFCC/FCC_F100649_03_01.html) |
| Raw material | Mainly waste brewer's yeast and other yeast streams such as baker's yeast, *Candida utilis*, *Candida tropicalis*, and *Kluyveromyces marxianus*[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) |
| Composition | Partly hydrolyzed protein with 35–40% free amino acid, plus B vitamins and trace elements; about 5% w/w free and 10% w/w total glutamate[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) |
| Production | Principally autolysis using the yeast's own enzymes; acids or exogenous food-grade enzymes may be added for hydrolysates[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) • [3](https://doi.usp.org/USPFCC/FCC_F100649_03_01.html) |
| US regulatory status | Bakers yeast extract affirmed as GRAS (21 CFR 184.1983), used as a flavoring agent and adjuvant at levels not to exceed 5 percent in food[4](https://ecfr.io/Title-21/Section-184.1983) |
| Commercial history | The first yeast extract company was started in the UK in 1902, with the commercial product named Marmite[5](https://www.savorytastealliance.org/about-yeast-extract/history-of-yeast-extract/) |
| Flavor profile | Meaty, kokumi, umami, and salty tastes, along with taste-masking properties, depending on the production method[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) |
## Definition and composition
Yeast extract is usually defined as the water-soluble extract produced from yeast waste streams, such as baker's yeast, brewer's yeast, *Candida utilis*, *Candida tropicalis*, and *Kluyveromyces marxianus*, following disruption of the cell membrane by various means. In the food industry it is also called "yeast hydrolysate," and it is regarded as Generally Recognized as Safe (GRAS) by most food safety certification bodies.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) The Food Chemicals Codex definition matches this scope: it comprises the water-soluble components of the yeast cell, primarily amino acids, peptides, carbohydrates, and salts.[3](https://doi.usp.org/USPFCC/FCC_F100649_03_01.html)
The main nutritional components are partly hydrolyzed protein, with 35–40% of the amino acids in free form, together with [B vitamins](https://www.edgepedia.org/b-vitamins) and some trace elements.[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) [Glutamic acid](https://www.edgepedia.org/glutamic-acid), the amino acid responsible for umami taste, is present at about 5% w/w in free form and about 10% w/w as total glutamate.[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) One extract obtained by mechanical crushing was reported at 64.1% protein (dry weight), 1.32% fat, and 4% RNA.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) Essential amino acids account for up to 40% of the total amino acids, a level the review literature notes meets UNFAO and WHO standards for essential amino acid content in healthy foods.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/)
## Production
Yeast extract production starts with a selected yeast grown on a sugar source such as molasses, with temperature and oxygen levels monitored to optimize growth.[6](https://ptacts.uspto.gov/ptacts/public-informations/petitions/1550605/download-documents?artifactId=xjHAtYuDE8K35AY3ow-v9ei4J1UMR9btLkZmqYs_f6X6uTRRlImKkyo) Three distinct manufacturing practices are described: autolysis, plasmolysis, and hydrolysis.[7](https://tga.blv.ifmt.edu.br/media/filer_public/22/a1/22a10c2b-af87-4370-b3a9-ca41eda2c31c/kavanagh_-_fungi_-_biology_and_applications_-_2ed_-_2011.pdf) In autolysis, the yeast's own endogenous enzymes degrade the cell contents; enzymatic degradation with exogenous enzymes and physical or cell-wall disruption techniques are alternatives.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) • [8](https://pubmed.ncbi.nlm.nih.gov/40155090/) The US regulation for bakers yeast extract describes the ingredient as resulting from concentration of the solubles of mechanically ruptured cells of a selected strain of *Saccharomyces cerevisiae*.[4](https://ecfr.io/Title-21/Section-184.1983)
The choice of yeast strain affects the product. In one comparative study, yeast extract powders produced from *Saccharomyces cerevisiae* TGM10, *Saccharomyces boulardii* S11, and *Kluyveromyces marxianus* TGM66 had protein contents of 69.17%, 66.16%, and 62.42% respectively, with the *S. cerevisiae* extract also the richest in essential amino acids.[9](https://pubmed.ncbi.nlm.nih.gov/34632953/)
## Flavoring properties and food uses
Yeast extracts provide diverse flavors depending on the production method, including meaty, kokumi, umami, and salty tastes, along with taste-masking properties.[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) Even when they contribute glutamate to foods at levels under 1%, less than what pure MSG requires, yeast extracts can produce the umami sensation, the savory effect associated with monosodium glutamate (MSG).[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) This has made yeast extract prominent among the savory ingredients, alongside hydrolyzed vegetable protein (HVP), hydrolyzed animal protein (HAP), MSG, and nucleotides, used in the savory ingredients industry.[10](https://www.giract.com/downloads/GIRACT-Global_Savory_Ingredients_2019-2024-StudyDescription-PP-Web.pdf)
**Food applications.** Food-flavoring agents are an important application, with the flavors mainly meat flavor and barbecue flavor; heat treatment of yeast extract under optimized conditions produces an umami/meat aroma in which furans and pyrazines are major aroma contributors.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) Yeast extract-based seasonings have been investigated as salt replacements, showing potential to replace salt in foods while maintaining taste and nutritional value.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) In consumer testing of Korean Doenjang soup, acid-hydrolyzed and enzyme-hydrolyzed vegetable proteins showed flavor-enhancing effects similar to MSG, and consumers preferred specific HVP-added samples to MSG-added samples; this work on HVP, a closely related savory ingredient, illustrates the demand for MSG alternatives that yeast extract also serves.[11](https://pmc.ncbi.nlm.nih.gov/articles/PMC6949330/) In chicken soup with reduced salt, yeast extract was studied among the substitutes for MSG, together with mushroom concentrate and tomato concentrate.[12](https://pmc.ncbi.nlm.nih.gov/articles/PMC6406985/) Yeast extract can also be useful in yogurt fermentation, where added low-molecular-weight peptides promoted the growth of beneficial bacteria and shortened fermentation time by 21%.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/)
Under EU food legislation, yeast extract is specified on ingredient lists either as "yeast extract" or as "natural aroma."[13](https://yeastextract.info/wp-content/uploads/2020/11/YeastExtract_Information-for-Food-Professionals_2020.pdf) In organic production in the EU, fermentation activators consisting of nutrients from yeast extract or autolysate are authorized within the limit of 5% of the substrate.[14](https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1750777502184&uri=CELEX%3A32025R0973)
## Other applications and bioactivity
Beyond food, yeast extracts are used in animal feed, cosmetics, pharmaceuticals, health products, and biotechnology, including use as microbial fermentation media and nitrogen sources.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) Their components, which include glucan, mannan, proteins, phospholipids, minerals, and vitamins, contribute to bioactivities reported in the review literature such as antioxidant, ACE-inhibitory, antibacterial, immunomodulatory, diuretic, and sedative effects.[8](https://pubmed.ncbi.nlm.nih.gov/40155090/) Recent reviews also position yeast extract as a more sustainable food ingredient, since it draws on yeast waste streams from brewing at low production cost.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/) • [8](https://pubmed.ncbi.nlm.nih.gov/40155090/)
## Relation to MSG and glutamate
Yeast extract, hydrolyzed vegetable proteins, and other savory ingredients all deliver free glutamate, the compound that gives MSG its flavoring effect; free dietary glutamate also occurs naturally in foods such as cheeses, tomatoes, mushrooms, soy sauces, and human milk.[6](https://ptacts.uspto.gov/ptacts/public-informations/petitions/1550605/download-documents?artifactId=xjHAtYuDE8K35AY3ow-v9ei4J1UMR9btLkZmqYs_f6X6uTRRlImKkyo) [Prejudice](https://www.edgepedia.org/prejudice) in society against MSG has directed food manufacturers toward alternative glutamate sources, including yeast extract.[9](https://pubmed.ncbi.nlm.nih.gov/34632953/) The main difference between the two ingredients in foods comes down to flavor: yeast extract contributes a broader savory character from its amino acids, peptides, and nucleotides rather than glutamate alone.[2](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131) • [15](https://www.healthline.com/health/food-nutrition/is-yeast-extract-bad-for-me)
## History
The first yeast extract company was started in the UK in 1902, and the commercial product was named Marmite, a spread made from brewer's yeast arising from beer-making.[5](https://www.savorytastealliance.org/about-yeast-extract/history-of-yeast-extract/) The raw material link to brewing remains central: yeast extract is prepared mainly from waste brewer's yeast, which is rich in nucleotides, proteins, amino acids, sugars, and a variety of trace elements, with low production cost and an abundant supply of raw material.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/)
## References
1. [Yeast Extract: Characteristics, Production, Applications and Future Perspectives, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC9998214/)
2. [Daniel Tomé (2021). Yeast Extracts: Nutritional and Flavoring Food Ingredients. ACS Food Science & Technology 1(4): 487–494.](https://pubs.acs.org/doi/10.1021/acsfoodscitech.0c00131)
3. [Yeast Extract, FCC Monograph, US Pharmacopeia](https://doi.usp.org/USPFCC/FCC_F100649_03_01.html)
4. [21 CFR 184.1983 – Bakers yeast extract, eCFR](https://ecfr.io/Title-21/Section-184.1983)
5. [History of yeast extract, Savory Taste Alliance](https://www.savorytastealliance.org/about-yeast-extract/history-of-yeast-extract/)
6. [Yeast Extracts: Nutritional and Flavoring Food Ingredients (full text via USPTO PTACTS)](https://ptacts.uspto.gov/ptacts/public-informations/petitions/1550605/download-documents?artifactId=xjHAtYuDE8K35AY3ow-v9ei4J1UMR9btLkZmqYs_f6X6uTRRlImKkyo)
7. [Kavanagh, Fungi: Biology and Applications, 2nd ed. (2011)](https://tga.blv.ifmt.edu.br/media/filer_public/22/a1/22a10c2b-af87-4370-b3a9-ca41eda2c31c/kavanagh_-_fungi_-_biology_and_applications_-_2ed_-_2011.pdf)
8. [Yeast extract as a more sustainable food ingredient: Insights into flavor and bioactivity, Advances in Food and Nutrition Research](https://pubmed.ncbi.nlm.nih.gov/40155090/)
9. [Production and characterization of yeast extracts produced by Saccharomyces cerevisiae, Saccharomyces boulardii and Kluyveromyces marxianus, PubMed](https://pubmed.ncbi.nlm.nih.gov/34632953/)
10. [GIRACT, Global Savory Ingredients 2019–2024 study description](https://www.giract.com/downloads/GIRACT-Global_Savory_Ingredients_2019-2024-StudyDescription-PP-Web.pdf)
11. [Effect of added hydrolyzed vegetable proteins on consumers' response for Doenjang soup, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC6949330/)
12. [Influence of Monosodium Glutamate and Its Substitutes on Sensory Characteristics and Consumer Perceptions of Chicken Soup, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC6406985/)
13. [Which foods is yeast extract used in? Yeast Extract Information for Food Professionals](https://yeastextract.info/wp-content/uploads/2020/11/YeastExtract_Information-for-Food-Professionals_2020.pdf)
14. [Commission Implementing Regulation (EU) 2025/973, EUR-Lex](https://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1750777502184&uri=CELEX%3A32025R0973)
15. [Is Yeast Extract Bad for Me? Healthline](https://www.healthline.com/health/food-nutrition/is-yeast-extract-bad-for-me)
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*Topic: Encyclopedia › Life and health › Microorganisms and fungi › Fungi and mycology › Other fungal taxa › Cryptomycota and other basal fungal lineages*
*Initially written Sep 17, 2026 · Reviewed: Oct 21, 2026 · Edited: Oct 15, 2026; Oct 21, 2026 · Last review: Oct 21, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license