The company focuses on vitamins, amino acids, plant extracts, sweeteners and other series of products, which have been widely used in food, health food, cosmetics, feed, veterinary medicine and other industries.
Products
High Purity L-Cysteine Base | ≥98% Feed, Food & Supplement Grade | CAS 52-90-4 Product Overview
Description:
Product Overview
L-Cysteine is a semi-essential sulfur-containing amino acid with a highly reactive thiol (-SH) side chain . This thiol group enables the formation of disulfide bonds critical for protein structure and participates in enzymatic reactions as a nucleophile . As a precursor to glutathione, one of the body's most important antioxidants, L-cysteine plays a fundamental role in cellular defense against oxidative stress .
At Henan Liyin Biotech, we supply high-purity L-Cysteine Base in the form of a white crystalline powder, with a minimum assay of ≥98% (typically 98.0–101.0%), compliant with AJI92 and food grade standards . Our product is available in Feed Grade, Food Grade, and Supplement Grade to serve applications across dietary supplements, food fortification, animal nutrition, and personal care.
Why Choose Our L-Cysteine?
Verified Purity: Assay ≥98.0% (typically 98.0–101.0%), ensuring consistent potency for all applications
Multi-Standard Compliance: Meets AJI92 and food grade specifications, providing regulatory acceptance
Proven Safety Profile: Generally recognized as safe for use in food and supplement applications
Complete Traceability: Each batch is accompanied by a comprehensive Certificate of Analysis (COA)
Flexible Packaging: Available in packaging options from 1kg to bulk quantities
Key Functional Properties
Glutathione Precursor & Antioxidant Defense
L-Cysteine is the rate-limiting precursor for glutathione (GSH) synthesis, one of the most important endogenous antioxidants in mammalian cells . By providing a readily available source of cysteine, supplementation boosts intracellular GSH levels, enhancing the cell's capacity to neutralize reactive oxygen species, detoxify xenobiotics, and regenerate other antioxidants like vitamins C and E .
Protein Structure & Disulfide Bond Formation
The thiol group of cysteine enables the formation of disulfide bonds (cystine), which are essential for the structural integrity and function of many proteins . This is particularly important in keratin, the structural protein of hair, skin, and nails .
Detoxification & Liver Support
L-Cysteine plays a crucial role in detoxification processes. It is used in the pharmaceutical industry to treat acetaminophen poisoning by replenishing glutathione in the liver, helping to detoxify harmful substances .
Dough Conditioning & Food Processing
In food applications, L-cysteine functions as a dough conditioner by breaking disulfide bonds in gluten, improving dough elasticity and texture . It is widely used as a flour treatment agent and processing aid in baking .
Cosmetic & Personal Care
In personal care formulations, L-cysteine is valued for its hair-conditioning, skin-conditioning, antistatic, and antioxidant properties . It is used in hair waving/straightening products and anti-aging formulations .
Quality Assurance & Documentation
All batches undergo rigorous quality control, including:
Assay by Titration: 98.0–101.0%
Specific Rotation: +8.3° to +9.5°
Heavy Metal Screening: ≤ 10 ppm
Microbiological Testing: Total plate count ≤ 1000 CFU/g
Other Amino Acids: Conforms to specifications
We provide complete documentation with every shipment, including Certificate of Analysis (COA), Material Safety Data Sheet (MSDS), and Allergen Statement. Our GMP-certified production
Parameters:
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Parameter
Specification
Product Name
L-Cysteine Base
CAS Number
52-90-4
Molecular Formula
C₃H₇NO₂S
Molecular Weight
121.16 g/mol
Assay (Purity)
98.0 – 101.0%
Appearance
White crystalline powder
Available Grades
Feed Grade, Food Grade, Supplement Grade
Standards
USP, EP, FCC
Specific Rotation
[α]²⁰/D +8.3° to +9.5° (c=5, 1N HCl)
pH (1g/100mL)
4.5 – 5.5
Loss on Drying
≤ 0.50%
Residue on Ignition
≤ 0.10%
Heavy Metals
≤ 10 ppm
Chlorides (Cl)
≤ 0.04%
Sulfates (SO₄)
≤ 0.03%
Ammonium (NH₄)
≤ 0.02%
Arsenic (As)
≤ 1 ppm
Iron (Fe)
≤ 10 ppm
Total Plate Count
≤ 1000 CFU/g
Yeast & Mold
≤ 100 CFU/g
Water Solubility
22.4 g/L at 20°C
Melting Point
286-288°C (dec.)
Solubility
1 M HCl: 50 mg/mL
Packaging Options
1kg, 5kg, 25kg (or as per request)
Documentation
Full COA, MSDS, Allergen Statement
Storage Conditions
Store in a cool, dry place, protected from light and air. Store under inert atmosphere (nitrogen) to prevent oxidation. Sensitive to air and moisture
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L-Cysteine is a semi-essential sulfur-containing amino acid that serves as the rate-limiting precursor to glutathione, one of the body's most important antioxidants. It plays a critical role in cellular defense against oxidative stress, protein structure through disulfide bond formation, and detoxification processes. Widely used as a dough conditioner in baking, as a nutritional supplement for antioxidant and liver health support, and in personal care formulations for hair and skin conditioning. Available in Feed, Food, and Supplement Grades with ≥98% purity, backed by full documentation and batch-to-batch consistency.
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Dietary Supplements
L-Cysteine is a popular ingredient in supplements targeting antioxidant defense, liver health, and overall wellness. Its role as a glutathione precursor makes it valuable in:
- Antioxidant Support: Boosts glutathione levels to protect cells from oxidative stress
- Liver Health: Supports detoxification processes and may help with liver protection
- Hair & Skin Health: Supports collagen production and keratin structure
- Immune Support: Plays a role in immune function through its antioxidant properties
- Typical Dosage: Supplementation levels vary by intended use. Generally recognized as safe when taken as directed.
Food & Beverage
L-Cysteine is widely used in the food industry as a dough conditioner, flavoring agent (FEMA 3263), and antioxidant .
Key Applications:
- Dough Conditioner: Breaks disulfide bonds in gluten, improving dough elasticity and handling
- Bread Improver: Used in baked goods to enhance texture and volume
- Flavor Enhancer: Contributes to flavor development, particularly in meat flavors through Maillard reactions
- Antioxidant: Prevents oxidation and browning in juices and processed foods
- Regulatory Status: Permitted for use as a food additive and processing aid. L-Cysteine is listed as a flour treatment agent with FEMA 3263 .
Usage Levels: Baked goods and bakery mixes typically contain 100-2000 ppm. Other applications include dairy products, confectionery, and meat products.
Animal Feed
L-Cysteine is used in animal nutrition as a feed additive to support growth and health in various species.
Key Applications:
- Nutritional Supplement: Provides a source of sulfur amino acids in animal diets
- Growth Support: Supports protein synthesis and overall development
- Broad Species Use: Suitable for poultry, swine, and aquaculture
Recommended Inclusion: Levels vary by species and production stage. Our Feed Grade L-Cysteine is formulated for optimal dispersion in premixes and pelleted feeds.
Personal Care & Cosmetics
L-Cysteine is used in personal care formulations for its hair-conditioning, skin-conditioning, antistatic, and antioxidant properties .
Cosmetic Functions :
- Hair Conditioning: Supports hair health and manageability
- Hair Waving/Straightening: Used in hair treatments
- Skin Conditioning: Supports skin health and anti-aging formulations
- Antistatic: Reduces static electricity in hair and skin products
- Antioxidant: Protects skin from oxidative stress
- Fragrance: May contribute to product fragrance profiles
Formula Compatibility: Stable in topical formulations when properly stored. Protect from light and air .
- Antioxidant Support: Boosts glutathione levels to protect cells from oxidative stress
Key words:
High Purity L-Cysteine Base | ≥98% Feed, Food & Supplement Grade | CAS 52-90-4 Product Overview
Function:
L-Cysteine is a semi-essential sulfur-containing amino acid that serves as the rate-limiting precursor to glutathione, one of the body's most important antioxidants. It plays a critical role in cellular defense against oxidative stress, protein structure through disulfide bond formation, and detoxification processes. Widely used as a dough conditioner in baking, as a nutritional supplement for antioxidant and liver health support, and in personal care formulations for hair and skin conditioning. Available in Feed, Food, and Supplement Grades with ≥98% purity, backed by full documentation and batch-to-batch consistency.
Application：
Dietary Supplements
L-Cysteine is a popular ingredient in supplements targeting antioxidant defense, liver health, and overall wellness. Its role as a glutathione precursor makes it valuable in:
- Antioxidant Support: Boosts glutathione levels to protect cells from oxidative stress
- Liver Health: Supports detoxification processes and may help with liver protection
- Hair & Skin Health: Supports collagen production and keratin structure
- Immune Support: Plays a role in immune function through its antioxidant properties
- Typical Dosage: Supplementation levels vary by intended use. Generally recognized as safe when taken as directed.
Food & Beverage
L-Cysteine is widely used in the food industry as a dough conditioner, flavoring agent (FEMA 3263), and antioxidant .
Key Applications:
- Dough Conditioner: Breaks disulfide bonds in gluten, improving dough elasticity and handling
- Bread Improver: Used in baked goods to enhance texture and volume
- Flavor Enhancer: Contributes to flavor development, particularly in meat flavors through Maillard reactions
- Antioxidant: Prevents oxidation and browning in juices and processed foods
- Regulatory Status: Permitted for use as a food additive and processing aid. L-Cysteine is listed as a flour treatment agent with FEMA 3263 .
Usage Levels: Baked goods and bakery mixes typically contain 100-2000 ppm. Other applications include dairy products, confectionery, and meat products.
Animal Feed
L-Cysteine is used in animal nutrition as a feed additive to support growth and health in various species.
Key Applications:
- Nutritional Supplement: Provides a source of sulfur amino acids in animal diets
- Growth Support: Supports protein synthesis and overall development
- Broad Species Use: Suitable for poultry, swine, and aquaculture
Recommended Inclusion: Levels vary by species and production stage. Our Feed Grade L-Cysteine is formulated for optimal dispersion in premixes and pelleted feeds.
Personal Care & Cosmetics
L-Cysteine is used in personal care formulations for its hair-conditioning, skin-conditioning, antistatic, and antioxidant properties .
Cosmetic Functions :
- Hair Conditioning: Supports hair health and manageability
- Hair Waving/Straightening: Used in hair treatments
- Skin Conditioning: Supports skin health and anti-aging formulations
- Antistatic: Reduces static electricity in hair and skin products
- Antioxidant: Protects skin from oxidative stress
- Fragrance: May contribute to product fragrance profiles
Formula Compatibility: Stable in topical formulations when properly stored. Protect from light and air .
About Us
Henan Liyin Biotech Co.,Ltd
We are is established in 2024,located in Zhengzhou,on the banks of the Yellow River-the revered “Mother River “of China .As a specialized supplier of human nutrition and animal health products ,the company focuses on a range of products including vitamins ,amino acids ,plant extracts ,and sweeteners,which are widely used in industries ,such as food ,health supplements,cosmetics ,feed and veterinary medicine .By integrating global product resources with the needs of international clients ,Liyin Biotech provides premium products and professional services tailored to each customer .
FAQ
How to contact ?
You can contact with us by Whatsapp:+86 15824830539, the Average Response Time is 0-4h on Work time, <24h on Non-worktime.
For every inquiry, our sales will provide the one-for-one service for you.
How about the payment terms ?
Normal orders: Company account ;Sample/small orders: Paypal(The 5-10% extrafee).About the payment term, we will negotiate alone.
How to get the samples ?
At the first time ,we can provide you the normal product <30g free sample
How to confirm the Product Quality before placing orders?
1st, you can get free samples for some products, just paythe basic cost for us.
2nd,Also you can send the specification or your quest tous, we will customize the products for you.3rd,We emphasis that our whole company make a livingwith organic chemical and customers, we absolutelyimpossible to sale any fake goods, unqualified goods, it isshame! And None False certificate/lie/illegal thing in oursales net!
Which kind of payment do you accept?
- As usually we use company account ,T/T in advance ,or at least 30% T/T in advance ,the balance can be paid by the copy of B/L
- For some countrys we can accept L/C at sight & DP at sight
- For smaples we can use Paypal (The 5-10% extra fees) or other ways
About the payment term, we will negotiate alone.
How about the shipment ?
1>For bulk goods ,we can use contaioner by sea ,1&20 and 1&40 contaioner
2>For urgently and expensive goods ,we can arrange the air lines for customers choose ,or can as customer required
3>For samples or small quantity goods ,we can use Fedex or other express ways
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As a specialized supplier of human nutrition and animal health products ,the company focuses on a range of products including vitamins ,amino acids ,plant extracts ,and sweeteners,which are widely used in industries ,such as food ,health supplements,cosmetics ,feed and veterinary medicine .
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