Is L-Cysteine Pescatarian?
CautionSometimes. L-Cysteine (e910) is a naturally occuring isomer of the cystein amino acid. Sources of cysteine include eggs, meat, dairy products, and some cereals, though it is commercially produced from hair, feathers, or coal tar.
L-Cysteine and the Pescatarian Diet
L-Cysteine, also known as E910, is a naturally occurring amino acid that plays a role in protein synthesis. It is commonly used in the food industry as a dough conditioner to improve the texture and shelf life of baked goods. Commercially, it is often produced from human hair, poultry feathers, or synthetically from coal tar. This ingredient is an isomer of the amino acid cysteine, which is present in many protein-rich foods such as eggs, meat, and dairy products.
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How Spoonful reviews ingredients
- Evidence-based. Diet compatibility ratings are compiled from peer-reviewed nutrition guidance, dietary association recommendations, and ingredient composition data.
- Continuously updated. Our ingredient database is refreshed as new sources and product data become available.
- Transparent uncertainty. When an ingredient's safety depends on serving size, preparation, or sub-ingredients, we mark it “caution” rather than forcing a binary answer.
- Not medical advice. Ratings are general guidance. Always consult a registered dietitian for personalized recommendations.
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