YISHENG MAOLIAN — SOURCING BRIEF
L-Cystine

SOURCE-LISTING SUMMARY, NOT A COA, TDS, APPROVAL OR BINDING QUOTATION.
Review status: technical and business confirmation pending.
Website: https://ymingredients.com/products/l-cystine/
Source checked: 2026-10-24

MATERIAL-REVIEW REFERENCES
Specification wording: 99% purity
Source CAS wording: 56-89-3
CAS entries need their relationship to the complete offered material confirmed; they do not establish the identity of an extract or carrier system.
Source form wording: Powder

LISTED TECHNICAL FIELDS
Source labels are retained for review. An ingredient label is not an approved analyte definition; a method label is not a complete analytical protocol.
Type: Amino acid
Shelf-Life: 24months
Dosage Form: Powder
Place of Origin: Shaanxi, China
Product Specification: 99%
Storage Method: Cool & dry place
Specification: 99% purity
Appearance: White crystalline powder
CAS No: 56-89-3
Molecular formula: C6H12N2O4S2
EINECS: 200-296-3
Sample: 10-20g — source listing only; availability, quantity, cost and delivery require confirmation.
Shelf life: 2 Years

SUPPLIER DETAIL TABLE — CHECKED 2026-10-25; NOT A LOT RESULT
CAS No.: 56-89-3
Appearance: White crystalline powder
Specification: 99% purity

OPEN QUESTIONS
Request the current written specification and confirm its relationship to the offered lot.

MATERIAL-SPECIFIC BUYER REVIEW
Purchasing questions and source interpretation; not additional approved specifications.
Is this the same catalogue material as L-cysteine?
No interchangeability is assumed. The catalogue has separately named L-Cystine and L-Cysteine records. Specify the exact compound and verify its identity reference and grade rather than choosing by similar spelling.
What should accompany the 99% listing statement?
Request the current written assay definition, reporting basis and lot-related analytical record. A catalogue purity statement is not a test result for a new shipment.

DOCUMENT REQUEST (AVAILABILITY NOT ASSUMED)
Current specification and complete composition
Representative COA and analytical methods, with lot relationship
Relevant safety and application records for the intended use

SOURCE-LISTING COMMERCIAL REFERENCES
These listing references are not an approved current offer. Confirm the actual quantity, unit, packaging and delivery terms in writing.
Source-listed MOQ: 1 kg
Delivery schedule: request confirmation for the selected grade, quantity, documents and destination.

YOUR COMMERCIAL BRIEF
Target grade / method: __________________
Intended application / destination: __________________
Sample or purchase quantity and unit: __________________
Packaging / delivery deadline: __________________

SOURCE LISTINGS
https://www.alibaba.com/product-detail/Wholesale-CAS-56-89-3-Food_1600368744598.html

CONTACT
Xi'an Yisheng Maolian E-Commerce Co.,Ltd
西安翊昇贸联电商有限公司
Room 1403, T162, Tower A, Huixin Center, No. 1 Zhangba 1st Road, High-tech Zone, Xi'an, Shaanxi, China
陕西省西安市高新区丈八一路1号汇鑫中心-A座1403室T162
sales@ymingredients.com
+86 18135720426

Representative images do not establish identity, composition, purity or actual batch appearance.