Is L-Cysteine Hydrochloride Pescatarian?
CautionSometimes. L-Cysteine hydrochloride (e920) 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 Hydrochloride and the Pescatarian Diet
L-Cysteine Hydrochloride (E920) is a derivative of the amino acid cysteine, used primarily in food as a dough conditioner to improve the texture and workability of bread and baked products. Cysteine itself is a naturally occurring amino acid found in many high-protein foods, such as eggs and meat, but the commercial form is often synthesized or extracted from animal sources like hair or feathers, though synthetic versions are also available.
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- 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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