About QSC (Qingdao Sigma Chemical)

QSC Wellness is an information resource published by Qingdao Sigma Chemical Co., Ltd. (QSC) — a research peptide manufacturer headquartered in Qingdao, China. The QSC online store operates at qscpeptide.com and ships to customers in 8 regions worldwide via domestic fulfilment warehouses.

Who is QSC?

Qingdao Sigma Chemical is known in the research peptide community as QSC, Qingdao Sigma Chemical, or Qingdao Sigma Chemicals. The company manufactures peptides via Fmoc solid-phase peptide synthesis (SPPS) and partners with specialist synthesis organisations for complex or large-scale compounds.

QSC has built a reputation over multiple years for consistently supplying ≥99% HPLC purity compounds with independent Janoshik COA — an approach that has earned recognition on community forums including Meso-Rx, Reddit's peptide communities, and Raw Peptides Reviews.

Quality Standards

• ≥99% HPLC purity — measured by reverse-phase HPLC at 220nm on every production batch
• Mass spectrometry identity confirmation — ESI-MS confirms correct molecular weight on every batch
• Janoshik COA — independent, publicly verifiable Certificate of Analysis
• Lyophilised powder form — maximum stability during shipping and storage
• Cold-pack shipping — thermal protection during transit

8-Region Domestic Warehouse Network

The QSC Network