Cosmetic Grade L-Cystine(CAS 56-89-3)
Product Name: L-Cystine
Abbreviation: L-Cys
Chemical Name: (R,R)-3,3'-Dithiobis(2-Aminopropanoic Acid)
CAS No.: 56-89-3
Grade: Cosmetic Grade (Skin & Hair Care Special)
Purity: ≥99.0%
Appearance: White Hexagonal Crystal or Crystalline Powder, Odorless, Slightly Sour Taste
Molecular Weight: 240.30
Molecular Formula: C₆H₁₂N₂O₄S₂
MOQ (Minimum Order Quantity): 1KG
Solubility: Slightly soluble in water, insoluble in ethanol, ether and other organic solvents, soluble in dilute mineral acid and alkali solution, stable dissolving state, clear solution without impurities
Specific Rotation: -215.0° ~ -225.0°
pH Value (1% Aqueous Solution): 5.0 - 6.5
Key Characteristics: Sulfur-containing essential amino acid, core component of keratin, efficient antioxidant, nourish hair and strengthen scalp, repair rough skin, mild and non-irritating, excellent formula stability, wide compatibility
Storage Condition: Sealed, dry, cool and dark ventilated environment, avoid high temperature, humid air and strong oxidation environment, prevent moisture deterioration, discoloration and efficacy attenuation
Shelf Life: 24 Months
Application: Widely used in hair nourishing and repairing products, scalp care series, antioxidant skin care lotion and cream, rough skin conditioning products, mild functional cosmetics and daily beauty care formulas
L-Cystine, Cosmetic Grade L-Cystine, Hair Care Amino Acid, Skin Antioxidant, Keratin Synthesis Agent, Scalp Repair Raw Material, Mild Cosmetic Additive, Anti-Aging Skin Care Ingredient
Cosmetic Grade L-Cystine(CAS 56-89-3)
Cosmetic-grade L-Cystine is a high-purity sulfur-containing essential amino acid refined by advanced biological hydrolysis and purification technology, which is an indispensable core raw material for keratin synthesis of human skin, hair and nails.
With unique disulfide bond molecular structure, it is the key structural unit constituting hair and scalp keratin, which can effectively supplement hair nutrient deficiency, repair damaged hair scales, improve dry, frizzy, brittle and split hair problems, and strengthen hair root firmness.
In skin care application, L-Cystine has excellent antioxidant activity, which can scavenge skin free radicals, reduce oxidative aging damage, inhibit dull and rough skin texture, and improve skin dryness and coarseness. It can participate in skin collagen and keratin metabolism, enhance skin tissue toughness, repair dry and damaged stratum corneum, and make skin delicate and smooth.
Featuring ultra-mild natural amino acid properties, skin-friendly pH value, no irritation and no burden on skin and scalp, it has stable formula activity and is not easy to deteriorate. It can be perfectly compounded with moisturizing, repairing and anti-aging ingredients, and is a high-quality dual-purpose raw material for high-end skin beauty and hair care cosmetics.
Key Benefits
• Core Keratin Synthesis, Strengthen Hair Quality: As the main component of hair keratin, it fills hair nutrient gaps, repairs damaged scales, improves dryness, frizz and split ends, and makes hair smooth and glossy.
• Antioxidant & Relieve Skin Roughness: Effectively scavenge skin free radicals, resist oxidative aging, improve dull, dry and rough skin texture, and restore skin delicate and smooth state.
• Repair Damaged Skin & Strengthen Toughness: Participate in skin keratin metabolism, repair dry and damaged stratum corneum, enhance skin tissue toughness, reduce dry peeling and fine dry lines.
• Soothing & Mild Scalp Care: Natural amino acid formula, mild and non-irritating, nourishes scalp basal layer, relieves scalp dryness and tightness, balances scalp microenvironment.
• Stable Formula & Long Efficacy: High-purity low-impurity quality, resistant to oxidation and deterioration in conventional cosmetic formulas, stable long-term activity, extending finished product shelf life.
• Wide Compatibility & Synergistic Effect: Perfectly compatible with moisturizing factors, plant extracts, vitamins and other ingredients, synergistically repair skin and hair, and improve comprehensive care efficacy.
Applications
• Hair Care & Scalp Nourishing Series: Core functional raw materials for hair conditioner, hair mask, repair shampoo and scalp care lotion, specially improving dry, frizzy and damaged hair.
• Antioxidant Skin Care Products: Applied in antioxidant essence, moisturizing lotion and rough skin conditioning cream to scavenge free radicals and improve dull and coarse skin.
• Dry Skin Repair & Moisturizing Formulas: Added in dry skin care cream, stratum corneum repair products and daily moisturizing skin care to relieve dry peeling and refine skin texture.
• Mild Sensitive Care Cosmetics: Suitable for mild amino acid skin care and scalp care products, low-sensitivity and non-irritating, safe for long-term daily care.
• High-End Compound Beauty Care Products: Used in high-end skin and hair dual-care formulas, enrich product nutritional components and enhance comprehensive repair and nourishing efficacy.
Certificate Of Analysis (COA)
Test Item | Standard Specification | Test Result |
Product Name | L-Cystine | Compliant |
CAS No. | 56-89-3 | Compliant |
Appearance | White Crystalline Powder, Odorless | Compliant |
Purity | ≥99.0% | 99.72% |
Specific Rotation | -215.0° ~ -225.0° | -220.6° |
Loss on Drying | ≤0.2% | 0.06% |
Residue on Ignition | ≤0.1% | 0.02% |
Heavy Metal (Pb) | ≤10ppm | Qualified |
Arsenic (As) | ≤2ppm | Qualified |
pH Value (1% Solution) | 5.0 - 6.5 | 5.7 |
Conclusion | Conforms to cosmetic grade quality standard | Qualified |
Frequently Asked Questions (FAQ)
• Q1: What is the MOQ of cosmetic grade L-Cystine? A1: The standard MOQ is 1KG, and sample orders are supported for quality testing.
• Q2: What certification documents can be provided? A2: Complete COA, MSDS and full set of global customs clearance documents are available.
• Q3: What is the recommended dosage in cosmetic formulas? A3: Conventional addition ratio is 0.2%-2.0%, stable in anti-oxidation, skin repairing and hair nourishing effects, mild and non-irritating.
• Q4: What is the core feature of L-Cystine? A4: It is a special sulfur-containing amino acid, the core raw material for keratin synthesis, realizing dual care of skin antioxidant repair and hair strengthening and nourishing, with unique differentiated efficacy.
• Q5: Is L-Cystine suitable for sensitive scalp and skin? A5: Yes, it is pure natural mild amino acid ingredient, low-sensitivity and non-irritating, safe for sensitive skin and fragile scalp care formulas.
• Q6: Do you support stable large-batch supply all year round? A6: Sufficient factory capacity ensures continuous and stable bulk supply throughout the year.
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