Name: China Cysteine Powder 52-90-4 Manufacturers Suppliers Factory - Purea Biological
Brand: Purea
SKU: 293294731

What is Cysteine Powder 52-90-4?

Cysteine Powder (CAS No. 52-90-4) is a sulfur-containing amino acid raw material with L-cysteine as its main component. It is typically a white crystalline powder with some water solubility and strong reducing properties, and is widely used in food, dietary supplements, pharmaceuticals, and cosmetics. Cysteine is a conditionally essential amino acid; the human body can synthesize it from methionine under certain conditions, but additional supplementation may be necessary during periods of stress, illness, or increased nutritional needs. Physiologically, cysteine is a key precursor to glutathione, an important antioxidant in the body, and plays a crucial role in maintaining cellular redox balance. With excellent functional properties and strong formulation compatibility, L-Cysteine has become an essential ingredient for manufacturers seeking high-quality amino acid raw materials.

Our bulk Cysteine Powder is produced under strict quality control standards, offering high purity, stable performance, and suitability for large-scale B2B production.

COA

Analysis	Specification	Result
Physical Description
PH	4.5 ~5.5	4.8
Specific optical rotation[a]_D²⁰	+ 8.3° ~ +9.5°	+8.5°
State of solution (Transmittance)	95.0% Min	98.5%
Chemical Tests
Assay	98.5%~101.0%	98.5%
Residual on ignition	0.1% Max	0.08%
Loss on drying	0.5% Max	0.37%
Chloride(Cl)	0.04% Max	0.04%
Sulfate(SO₄)	0.03% Max	0.02%
Iron(Fe)	10.0ppm Max	<10.0ppm
Ammonium (NH₄)	0.02% Max	<0.02%
Arsenic(As₂O₃)	1.0ppm Max	<1.0ppm
Heavy metal (Pb)	10.0ppm Max	<10.0ppm
Conclusion	Complies with the AJI92 Standard.
General Status	Non-GMO, ISO Certificated.
Packing and Storage
Packing: Pack in paper-carton and two plastic-bags inside.
Shelf life: 2 year when properly stored.
Storage: Store in a well-closed place with constant low temperature and no direct sun light.

What are the benefits of Cysteine Powder 52-90-4?

1. Supporting Antioxidant Protection as a Glutathione Precursor

Cysteine is one of the key rate-limiting precursors in the synthesis of glutathione. Glutathione is an important antioxidant in human cells, participating in the scavenging of free radicals and maintaining cellular redox balance. By providing raw materials for glutathione synthesis, cysteine nutritionally supports the body's antioxidant defense system, helping cells cope with daily environmental stress and metabolic oxidative burden.

2. Supporting Liver Detoxification-Related Metabolic Processes

Glutathione plays a central role in liver detoxification, participating in the binding of various metabolic wastes or exogenous substances and promoting their excretion. Since cysteine is one of the important sources of glutathione, it is closely related to normal liver metabolic function at the nutritional support level and is often used in liver health support formulations.

3. Maintaining the Structural Integrity of Skin, Hair, and Nails

Cysteine contains sulfur, which can form disulfide bonds in protein molecules. This structure is crucial for the stability of keratin. Keratin is a crucial structural protein in hair, skin, and nails. Therefore, cysteine nutritionally supports the structural strength and normal growth of these tissues and is commonly found in beauty and hair health products.

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4. Participation in Protein Synthesis and Tissue Repair

As one of the basic amino acids that make up proteins, cysteine participates in the synthesis of various proteins and enzymes in the body, playing a fundamental nutritional role in cell renewal and tissue repair. It supports overall amino acid balance when the body is under stress, recovering from exercise, or experiencing increased tissue renewal needs.

5. Participation in Immune System-Related Nutritional Support

Glutathione levels are closely related to the normal function of immune cells. By participating in glutathione synthesis, cysteine nutritionally helps maintain the antioxidant environment required by immune cells, thereby supporting normal immune function. This is one reason why it is gaining attention in comprehensive health formulations.

6. Comprehensive Value in Functional Foods and Formulation Applications

Cysteine powder has good compatibility and is often used in combination with antioxidant nutrients such as vitamin C, selenium, and zinc in antioxidant support, beauty nutrition, or comprehensive health products. In addition, it can be used as a dough improver in the food industry, demonstrating its multiple application values from nutrition to food processing.

Applications of Cysteine Powder (CAS 52-90-4)

Application Area	Real-World Example	Main Function in Formulation	Detailed Application Description
Nutraceutical Supplements	Amino acid capsules, antioxidant complex tablets	Functional sulfur-containing amino acid	Cysteine Powder is incorporated into multi-amino acid and specialty wellness formulas where sulfur-containing amino acids are required for balanced nutritional profiles. Suitable for capsules, tablets, and powder blends.
Sports Nutrition	Recovery drink powders, amino acid performance blends	Structural amino acid component	Used in sports and active lifestyle supplements as part of comprehensive amino acid formulations designed for protein-related nutritional support.
Functional Foods	Fortified nutrition powders, protein blends	Amino acid fortification ingredient	Applied in functional food products to enhance amino acid composition and support protein-based formulations in health-oriented food products.
Bakery & Food Processing	Bread improvers, dough conditioners	Processing aid in dough systems	L-Cysteine is widely used in the baking industry as a dough conditioning agent, helping improve dough handling properties in industrial-scale bread production.
Pharmaceutical Applications	Intermediate and specialty formulations	Amino acid raw material	Used as a pharmaceutical intermediate or formulation component where amino acid derivatives are required under controlled quality standards.
Cosmetic & Personal Care	Hair care treatments, strengthening formulas	Sulfur-containing structural ingredient	Incorporated into cosmetic formulations, particularly hair care products, due to its role in keratin-related structures and specialty beauty formulations.
OEM / Contract Manufacturing	Private label supplement blends	Stable bulk amino acid raw material	Preferred by contract manufacturers for its high purity, consistent quality, and compatibility with automated blending, encapsulation, and tableting systems.

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Production Process of Cysteine Powder

Manufacturing high-purity Cysteine Powder involves several carefully controlled stages to ensure quality and consistency suitable for B2B supply.

1. Raw Material Selection

Production begins with high-quality precursor materials obtained through controlled fermentation or synthetic processes, depending on the manufacturing method. Strict supplier qualification ensures consistent starting quality.

2. Fermentation or Synthesis

Modern industrial production commonly uses microbial fermentation technology to produce L-Cysteine, offering better sustainability and purity control compared to traditional extraction methods.

3. Purification & Filtration

The crude solution undergoes multiple purification steps including filtration, decolorization, and crystallization to remove impurities and by-products.

4. Crystallization & Drying

Purified cysteine is crystallized and dried under controlled conditions to preserve stability and prevent degradation.

5. Milling & Sieving

The dried crystals are milled into a uniform fine powder to ensure good flowability and compatibility with industrial blending processes.

6. Quality Control Testing

Each batch is tested for:

★Assay (purity)

★Loss on drying

★Heavy metals

★Microbial limits

Only batches meeting international quality standards are released for supply.

FAQ

Q1: What grade of Cysteine Powder is available?

A: Food grade, pharmaceutical grade, and nutraceutical grade are typically available depending on regulatory and application requirements.

Q2: Is your Cysteine Powder suitable for capsules and tablets?

A: Yes. The fine crystalline powder offers good flow properties and compressibility, making it ideal for capsule filling and tableting.

Q3: Do you provide COA and third-party testing reports?

A: Yes. Each batch is supplied with a Certificate of Analysis (COA), and third-party testing can be arranged upon request.

Q4: What packaging options are available for bulk supply?

A: Standard export packaging includes fiber drums or cartons with inner food-grade PE bags, suitable for international B2B transport.

Q5: Can this ingredient be used in combination amino acid formulas?

A: Yes. Cysteine Powder is commonly used in multi-amino acid blends due to its functional and structural compatibility.

Where to buy Cysteine Powder 52-90-4?

Pure Biological provides high-quality Cysteine Powder 52-90-4, supports customer OEM customization, from samples to bulk goods, can respond quickly, and has a good service foundation.

Please contact us by email for more information.Email:sales@pureabio.com

Certifications

Purea Biological Technology Co., Ltd. focuses on plant extracts and biopharmaceuticals, backed by authoritative certifications including ISO9001 and SC. We adhere to global quality standards, implement full-chain quality control, and deliver compliant, reliable products to support overseas partners in food, health products and pharmaceutical fields.

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Production Environment

Purea Biological Technology Co., Ltd. boasts a modern production base equipped with advanced equipment and technology. From raw material selection to extraction, separation, and purification, we strictly adhere to standard procedures to ensure the reliable quality of each batch of products. We have extremely strict quality control and a comprehensive quality control system. We rigorously control the quality of raw materials from the source, monitor the entire production process, and use advanced equipment to carefully inspect finished products.

Production Environment