Cosmetic Grade L-Cysteine(CAS 52-90-4)
Product Name: L-Cysteine
Abbreviation: L-Cys
Chemical Name: L-2-Amino-3-Mercaptopropanoic Acid
CAS No.: 52-90-4
Grade: Cosmetic Grade (Skin & Hair Care Special)
Purity: ≥99.0%
Appearance: White Crystalline Powder, Characteristic Mild Odor, Sour Taste
Molecular Weight: 121.16
Molecular Formula: C₃H₇NO₂S
MOQ (Minimum Order Quantity): 1KG
Solubility: Easily soluble in water, soluble in dilute alcohol, insoluble in organic solvents, fast dissolution rate, transparent and stable aqueous solution without precipitation
Specific Rotation: +8.0° ~ +10.0°
pH Value (1% Aqueous Solution): 4.5 - 6.0
Key Characteristics: Active sulfur-containing amino acid, powerful reducing antioxidant, inhibit melanin activity, repair damaged hair keratin, accelerate skin metabolism, mild and skin-friendly, excellent formula synergy, stable cosmetic compatibility
Storage Condition: Sealed, low-temperature, dry and dark ventilated environment, avoid high temperature, strong light and air oxidation, prevent discoloration and efficacy loss, sealed storage to isolate oxygen
Shelf Life: 24 Months
Application: Widely used in brightening and dullness-removing skin care products, antioxidant anti-aging formulas, damaged hair repair series, exfoliating and metabolic conditioning cosmetics, daily mild skin and hair care products
L-Cysteine, Cosmetic Grade L-Cysteine, Sulfur-Containing Amino Acid, Skin Brightening, Efficient Antioxidant, Hair Damage Repair, Anti-Aging Cosmetic Raw Material, Mild Skin Care Additive
Cosmetic Grade L-Cysteine(CAS 52-90-4)
Cosmetic-grade L-Cysteine is a high-activity sulfur-containing amino acid refined by advanced bio-enzymatic hydrolysis technology, featuring unique sulfhydryl (-SH) active structure, which endows it stronger reducing antioxidant capacity than ordinary amino acids. As an essential raw material for human keratin and glutathione synthesis, it occupies a core position in skin metabolism and hair repair.
In skin care, L-Cysteine can efficiently neutralize oxidative free radicals, block skin oxidative aging chain reaction, and significantly improve dull, yellowish and rough skin texture. It can inhibit the abnormal activity of melanocytes, reduce melanin deposition caused by oxidation and UV stimulation, fade superficial dullness and faint pigmentation, and brighten overall skin translucency.
Meanwhile, it accelerates stratum corneum metabolism, helps discharge aging waste keratin, and keeps skin delicate and smooth. In hair care applications, it supplements missing sulfur-containing active groups in damaged hair, repairs broken keratin bonds and damaged hair scales, improves dry, frizzy, withered and brittle hair after perm and dye, and restores hair smoothness and luster.
With ultra-mild weak-acid skin-friendly properties, no irritation to skin and scalp, and excellent formula compatibility, it can be compounded with various brightening, antioxidant and moisturizing ingredients. It is a versatile high-efficiency raw material for high-end skin brightening, anti-aging and damaged hair repair cosmetics.
Key Benefits
• Strong Reductive Antioxidant, Anti-Aging: Unique sulfhydryl active structure, efficiently scavenges free radicals, blocks oxidative aging, delays skin fine lines and sagging, and maintains youthful skin condition.
• Inhibit Melanin & Brighten Dull Skin: Suppress melanin activity, reduce oxidative pigment deposition, improve yellowish and dull complexion, fade superficial pigmentation, and enhance skin translucency.
• Accelerate Skin Metabolism & Refine Texture: Boost stratum corneum renewal speed, remove aging waste keratin, improve rough and coarse skin, and make skin delicate and smooth.
• Repair Damaged Hair & Nourish Scalp: Repair broken keratin chains of perm and dye damaged hair, fit hair scales, improve dryness, frizz and brittleness, and restore hair silky luster.
• Mild Weak-Acid & Wide Adaptability: Natural active amino acid, skin-friendly pH value, zero irritation to sensitive skin and fragile scalp, safe for long-term compound use.
• Excellent Formula Synergy: Highly compatible with VC derivatives, glutathione, moisturizing and repairing ingredients, forming multi-dimensional antioxidant brightening system to multiply product efficacy.
Applications
• Brightening & Dullness-Removing Skin Care Series: Core functional raw materials for brightening essence, yellow-removing lotion and translucent skin cream, targeting oxidative dullness and uneven skin tone.
• High-Efficiency Antioxidant Anti-Aging Products: Applied in antioxidant essence, early anti-aging skin care formulas, fine line repair and firming skin care to delay skin oxidative aging.
• Damaged Hair Repair & Care Series: Added in perm and dye repair shampoo, hair conditioner, hair mask and scalp care products to improve dry, frizzy and brittle damaged hair.
• Metabolic Exfoliating Conditioning Formula: Suitable for mild skin renewal and conditioning products, accelerate skin metabolism, improve rough texture and brighten skin tone.
• High-End Mild Compound Cosmetics: Used in high-end skin and hair dual-care formulas, matched with various functional ingredients to enhance comprehensive antioxidant and brightening repair efficacy.
Certificate Of Analysis (COA)
Test Item | Standard Specification | Test Result |
Product Name | L-Cysteine | Compliant |
CAS No. | 52-90-4 | Compliant |
Appearance | White Crystalline Powder, Slight Characteristic Odor | Compliant |
Purity | ≥99.0% | 99.73% |
Specific Rotation | +8.0° ~ +10.0° | +9.2° |
Loss on Drying | ≤0.2% | 0.05% |
Residue on Ignition | ≤0.1% | 0.02% |
Heavy Metal (Pb) | ≤10ppm | Qualified |
Arsenic (As) | ≤2ppm | Qualified |
pH Value (1% Solution) | 4.5 - 6.0 | 5.2 |
Conclusion | Conforms to cosmetic grade quality standard | Qualified |
Frequently Asked Questions (FAQ)
• Q1: What is the MOQ of cosmetic grade L-Cysteine?
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 0.1%-1.8%, with stable antioxidant, brightening and hair repairing effects, mild and non-irritating.
• Q4: What is the difference between L-Cysteine and L-Cystine?
A4: L-Cysteine has active sulfhydryl group with stronger reducibility and better brightening and metabolic renewal effects; L-Cystine focuses more on keratin structural repair and hair strengthening; the two can be compounded for full-dimensional skin and hair care.
• Q5: Is L-Cysteine suitable for sensitive skin formulas?
A5: Yes, it is ultra-mild natural amino acid with skin-friendly weak acid properties, low sensitization and zero irritation, safe for sensitive skin and fragile scalp care.
• 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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