The Lab
Specimen No. 0220
CautionDerivedfood additiveflavor enhancer

Yeast Extract

autolyzed yeast · autolyzed yeast extract · hydrolyzed yeast

Flavor enhancer made by breaking down yeast cells to release naturally occurring free glutamate — the same umami compound as added MSG. Widely used as a "clean-label" way to add glutamate without listing MSG on the label.

medium confidence
Researched July 7, 2026

Concerns

  • FDA states that yeast extract and autolyzed yeast naturally contain free glutamate (the glutamate in MSG); foods containing them therefore cannot be labeled "No MSG" or "No added MSG" (FDA)
  • The honest concern is label transparency rather than toxicity: a comprehensive review found most reported adverse effects of glutamate/MSG come from animal studies at doses far above dietary intake, and that 'MSG symptom complex' is poorly supported in controlled human trials (Zanfirescu et al. 2019)

Regulatory flags

  • IARC Class: NL
  • EDC Status: None
  • Regulatory: US: GRAS; EU: permitted
  • Evidence Grade: B

Commonly found in

Marmite / yeast spreadsSoupsSaucesProcessed meatsSavory snacks

Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.

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