L-Cystine, Natural Sulfur-Containing Amino Acid(CAS 56-89-3)
Product Name: High-Purity L-Cystine Natural Disulfide Amino Acid Anti-Oxidation Anti-Glycation Barrier Repair Brightening Anti-Aging Cosmetic Raw Material
INCI Name: L-Cystine
Alias: Cystine Amino Acid, Disulfide Skin Repair Factor, Endogenous Antioxidant Active, Anti-Glycation Brightening Essence, Skin Firming Stabilizing Factor, Barrier Reinforcement Element
CAS No.: 56-89-3
Appearance: White fine crystalline powder, pure uniform texture, odorless, stable formula activity, excellent pH and temperature tolerance.
Grade: Cosmetic High-Purity Biochemical Grade
Source: This product adopts pure biological fermentation raw materials and green low-temperature purification process, completely retaining the natural disulfide bond active structure of L-Cystine without chemical residue.
MOQ (Minimum Order Quantity): 25KG
Solubility: Slightly soluble in water, easily soluble in dilute acid and alkaline water-phase systems, transparent and uniform solution after dissolution without precipitation and stratification.
Storage Condition: Sealed and stored in dry, cool and ventilated warehouse at 5–25℃, strictly avoid strong light direct irradiation, high temperature and humid environment to prevent structural activity attenuation. Keep tightly sealed after opening, avoid long-term air contact and moisture absorption, and ensure long-term stable barrier repair, anti-oxidation and brightening anti-aging efficacy.
Shelf Life: 24 Months
L-Cystine, Natural Sulfur-Containing Amino Acid, Antioxidant, Anti-Glycation, Skin Barrier Repair, Translucent Brightening, Anti-Aging, Cosmetic Raw Material
L-Cystine, Natural Sulfur-Containing Amino Acid(CAS 56-89-3)
L-Cystine is a high-stability natural disulfide structural amino acid anti-oxidation anti-glycation barrier repair raw material.
Relying on the unique dimer disulfide bond active structure, it is the core structural unit of skin keratin and barrier tissue.
It integrates triple core capabilities of skin structure reinforcement, endogenous free radical scavenging and anti-glycation de-yellowing.
It comprehensively solves skin problems such as fragile barrier sensitivity, oxidative dullness, glycation yellowness and loose aging texture.
It integrates multi-dimensional efficacies of barrier structure repair, anti-oxidation anti-aging, anti-glycation brightening and skin firming, effectively strengthens skin compactness, blocks dual aging pathways of oxidation and glycation, fades stubborn dull yellow tone, and restores skin delicate, firm and translucent healthy texture.
It is a core differentiated structural active for upgrading high-end sensitive skin repair, anti-glycation anti-aging and translucent brightening functional skin care formulas.
Key Benefits
•Unique Disulfide Structure, Reinforce Skin Barrier: Different from ordinary monomer amino acids, the stable disulfide bond dimer structure can effectively reinforce skin keratin arrangement, fill barrier gaps, improve skin fragility and sensitivity caused by damaged barrier, thicken skin protective layer, and build long-term skin defense.
•Endogenous Super Anti-Oxidation, Block Oxidative Aging: As a core sulfur-containing structural amino acid of the skin, it activates endogenous antioxidant defense, efficiently scavenges multi-dimensional excess free radicals, cuts off oxidative aging chain reaction from the source, prevents skin darkening and dullness, and delays skin laxity and aging.
•Stable Anti-Glycation Mechanism, Fade Stubborn Yellowing: Effectively inhibit collagen glycation cross-linking and Maillard reaction, reduce the production and accumulation of glycation yellow pigments, fundamentally improve long-term wax yellow and turbid dull skin caused by sugar erosion and external stress, and restore clear and bright skin tone.
•Structure Firming & Texture Refining: Participate in skin collagen and keratin synthesis, optimize skin tissue compactness, improve loose and rough texture, smooth early fine lines caused by structural laxity, and make skin delicate and firm.
•Mild & High Stability, Easy Industrial Matching: Natural biological fermentation source, ultra-mild and non-irritating, suitable for sensitive fragile skin; excellent temperature and pH resistance, stable activity in conventional formula processing, low debugging difficulty and suitable for mass production.
•Compound Synergy, High Formula Added Value: Perfectly compatible with cysteine, flavonoids and repair actives, forming a "repair + anti-oxidation + anti-glycation" full-effect closed-loop system, filling the market gap of structural anti-aging brightening amino acids and improving product differentiation competitiveness.
Applications
• Sensitive Barrier Repair Series: Core structural repair active for fragile sensitive skin, reinforce keratin barrier structure, relieve sensitivity and dryness, and stabilize skin microecology.
• Anti-Glycation De-Yellowing Brightening Products: Specialized anti-glycation functional active for long-term wax yellow and dull skin, block glycation reaction, fade accumulated yellow pigments, and brighten translucent skin tone.
• Endogenous Antioxidant Anti-Aging Formulas: Applied in high-end anti-aging essence and cream, activate skin endogenous antioxidant capacity, resist oxidative aging, and improve skin laxity and dullness.
• Skin Firming & Texture Refining Series: Suitable for loose and rough skin products, optimize skin tissue compactness, refine rough texture, smooth early fine lines, and firm skin contour.
• Daily Stable Skin Care Products: Added in daily moisturizing and brightening skin care products, long-term stabilize skin barrier, prevent dull and yellow rebound, and maintain healthy skin state.
• Amino Acid Compound Functional System: Perfectly compounded with L-Cysteine, myricetin, isorhamnetin and panthenol, building a closed-loop system of barrier repair, anti-oxidation, anti-glycation, brightening and anti-aging firming.
Certificate Of Analysis (COA)
Test Item | Standard Specification | Test Result |
Product Name | L-Cystine | Compliant |
Appearance | White Fine Crystalline Powder | Compliant |
Purity (%) | ≥99.0% (Customizable) | 99.42% |
Loss on Drying (%) | ≤0.5 | 0.18 |
Residue on Ignition (%) | ≤0.1 | 0.03 |
Specific Rotation | -215° ~ -225° | -220.6° |
Heavy Metal (Pb) | ≤1ppm | 0.1ppm |
Arsenic (As) | ≤0.5ppm | Not Detected |
Mercury (Hg) | ≤0.1ppm | Not Detected |
Cadmium (Cd) | ≤0.1ppm | Not Detected |
Total Bacteria | ≤100CFU/g | Qualified |
Pathogenic Bacteria | Negative | Negative |
Conclusion | Conforms to cosmetic grade quality standard | Qualified |
Frequently Asked Questions (FAQ)
• Q1: What is the MOQ of L-Cystine?
A1: The standard MOQ is 25KG, support sample orders for formula testing, barrier repair efficacy debugging, anti-glycation anti-aging formula trial production, and support customized purity specifications for mass production.
• Q2: What is the core formula positioning of L-Cystine?
A2: It is a high-value disulfide structural amino acid full-effect active integrating barrier structure reinforcement, endogenous anti-oxidation, anti-glycation de-yellowing, skin firming and translucent brightening. It is mainly used for high-end sensitive barrier repair, anti-glycation brightening and structural anti-aging formula upgrading.
• Q3: What is the recommended dosage in cosmetic formulas?
A3: Conventional barrier maintenance & brightening: 0.1%–0.3%; Anti-glycation de-yellowing series: 0.2%–0.4%; Sensitive skin repair formulas: 0.05%–0.2%; Structural anti-aging firming products: 0.1%–0.5%, adjustable according to product efficacy positioning and formula system.
• Q4: What are the differences and advantages compared with L-Cysteine?
A4: L-Cysteine focuses on detoxification and superficial antioxidant brightening, while L-Cystine relies on stable disulfide dimer structure, focusing on skin structural repair and long-term barrier stabilization. It has stronger keratin reinforcement and skin firming capabilities, making up for the deficiency of monomer amino acids in structural anti-aging, with more stable efficacy and longer duration.
• Q5: What raw materials is it suitable for compounding?
A5: It is highly compatible with L-Cysteine, myricetin, isorhamnetin, panthenol and centella asiatica extract. The compound system can synergistically strengthen barrier repair, endogenous anti-oxidation, anti-glycation de-yellowing and skin firming efficacy, realizing full-effect upgrading of high-end structural repair and anti-aging brightening skincare products.
• Q6: What are the formula usage notes?
A6: White crystalline powder, slightly soluble in water, recommended to dissolve in dilute acid or weak alkali water phase in advance; stable in pH 4.0–9.0 and conventional light and heat environment; avoid strong acid and strong alkali extreme conditions; suitable for emulsified and water-based barrier repair, brightening and anti-aging formulas with simple industrial debugging.
• Q7: Can it provide stable supply and professional technical support?
A7: Strictly control core indicators such as purity, specific rotation, moisture content, heavy metals and microbial indicators to ensure consistent batch stability. Support long-term bulk order supply, and provide one-stop professional services including barrier repair formula optimization, anti-glycation brightening upgrading, sensitive skin efficacy debugging and after-sales technical guidance.
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