About QSC Supply

QSC Supply (qsc-supply.com) is the B2B and wholesale information resource for Qingdao Sigma Chemical Co., Ltd. (QSC) — a research peptide manufacturer headquartered in Qingdao, Shandong Province, China. The QSC retail store operates at qsc-usa.com.

Manufacturing

QSC manufactures research peptides using Fmoc solid-phase peptide synthesis (SPPS). The Qingdao facility handles in-house synthesis for the majority of the catalogue, with vetted partner synthesis organisations covering specialist compounds (long sequences, unusual modifications). All partner-produced compounds are subject to QSC's full QC requirements before acceptance.

Full manufacturing documentation: qscpeptidelab.com/manufacturing.html

Quality Control

• ≥99% HPLC purity — reverse-phase HPLC at 220nm, every production batch
• ESI-MS identity confirmation — molecular weight verified against theoretical for every batch
• Janoshik COA — independent Certificate of Analysis, publicly verifiable online by batch number
• Lyophilised powder — maximum stability for transit and institutional storage

Distribution Network

QSC operates domestic fulfilment warehouses in 8 global regions, enabling local delivery without international customs exposure for the majority of institutional buyers. See the ordering guide for regional transit times.

The QSC Network