Research Peptide Manufacturer · Qingdao, China · Est. QSC
Qingdao Sigma Chemical
Direct manufacturer and partner-sourced supplier of research-grade peptides. In-house SPPS synthesis, ≥99% HPLC purity, Janoshik COA on every batch. Domestic distribution from 5 regional warehouses worldwide.
Shop at qscpeptide.com →Manufacturer
In-house SPPS + vetted partners
≥99% Purity
HPLC + MS every batch
5-Region Shipping
USA, EU, UK, CA, AU domestic
Janoshik COA
Independent verification
Company Overview
Qingdao Sigma Chemical (QSC) is an international research peptide manufacturer and partner-sourced supplier headquartered in Qingdao, China. QSC produces core peptides in-house using solid-phase peptide synthesis (SPPS), purified by preparative HPLC, verified by mass spectrometry, and lyophilized before distribution. QSC also partners with rigorously vetted manufacturers to expand its catalog — all products undergo identical QC.
QSC supplies laboratories and distributors in more than 100 countries from domestic warehouses in the United States, European Union, United Kingdom, Canada, and Australia.