CAS Number: 52-90-4
Source & Form: Fermentation-derived sulfur-containing amino acid; white crystalline or powder form
Applications: Food processing, pharmaceuticals, cosmetics, nutritional supplements
Advantages:
What is L-Cysteine?
L-Cysteine is a semi-essential, sulfur-containing amino acid naturally found in proteins. It plays a pivotal role in the body’s detoxification process, acting as a precursor to glutathione, one of the most important intracellular antioxidants. L-Cysteine supports immune function, liver health, and skin integrity, and is also widely used in industrial applications due to its reducing properties.
In the food industry, L-Cysteine is used as a dough softener (E920) to improve texture and elasticity in baked goods. It is also employed in flavor synthesis (e.g., meat flavors) and cosmetic formulations for its antioxidant and skin-repair properties. Our L-Cysteine is produced via non-GMO fermentation, making it suitable for vegetarian and halal/kosher applications.
EU Code: E920
Key Benefits:
✅ Boosts glutathione production to fight oxidative stress
✅ Improves liver detox and supports immune resilience
✅ Enhances skin elasticity and hair strength
✅ Improves dough handling and softness in bakery applications
✅ Non-GMO, vegan fermentation-sourced (feather/hair-free)
Applications:
FAQs:
Q: Is L-Cysteine safe for food use?
A: Yes, approved globally as E920, commonly used in baked goods and flavor formulations.
Q: Is it vegan?
A: Our version is plant-fermentation based and free from animal-derived sources (not made from feathers or hair).
Q: What is the role of L-Cysteine in the body?
A: It aids in detoxification, immune defense, and antioxidant protection via glutathione synthesis.
Q: Can it be used in supplements?
A: Yes, often found in liver detox, immune support, and skin/hair beauty formulas.

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Anrui Biotechnology Co., Ltd. is a specialized exporter of high-quality food ingredients and additives. We focus on global trade and custom formulation services for functional ingredients, delivering consistent, compliant, and premium-quality supply solutions to our worldwide clients.
Headquartered in Guangzhou, China, Anrui collaborates with GMP-certified manufacturing partners equipped with advanced testing facilities, including HPLC, UV-VIS spectrophotometry, and microbiological analysis, ensuring every batch meets strict international quality and regulatory standards.
Our products are exported to over 60 countries, serving industries such as food, beverages, supplements, and cosmetics.
Fast-moving ingredients for food factories, ready for immediate dispatch.