L-Cystine (CAS 56-89-3) – High-Purity Pharmaceutical & Cosmetic Grade

L-Cystine is a stable, sulfur-containing amino acid formed by the oxidation of two cysteine molecules. As a premier manufacturer, Yantai Hongyu Starry Biotech Co., Ltd. provides ultra-pure L-Cystine crystalline powder, a key raw material for hair growth treatments, pharmaceutical infusions, and advanced food processing globally.

Technical Specifications

Product Name	L-Cystine (Base)
CAS Number	56-89-3
HS Code	2930.9010.00
Molecular Formula	C6H12N2O4S2
Appearance	White crystalline powder or colorless crystals
Assay (Dry Basis)	98.5% – 101.5% (USP/AJI/FCC Standards)

Why Source from Hongyu Starry Biotech?

Hair & Skin Health Expertise

Our L-Cystine is optimized for hair care formulations, providing the essential sulfur bonds needed for keratin synthesis and anti-aging treatments.

Pharma-Grade Traceability

Produced under rigorous quality management, ensuring total traceability and minimal heavy metal content for pharmaceutical use.

Yantai Strategic Supply

Leveraging over 20 years of experience, we provide consistent inventory and direct shipping from Yantai’s major logistics hubs.

Comprehensive Certification

Full compliance with USP/AJI standards. Every shipment includes COA, MSDS, and TDS to speed up your quality approval process.

Primary Applications

Pharmaceuticals: Used in amino acid infusions and liver-supportive medications.
Cosmetic Industry: A core ingredient in hair growth supplements, nail care, and anti-aging skincare products.
Food Industry: Acts as a dough conditioner (bread improver) to optimize gluten elasticity in baking.
Bio-fermentation: An essential sulfur source for microbial culture media in laboratory research.