About Qingdao Sigma Chemical

Qingdao Sigma Chemical (QSC) is an international research peptide manufacturer and partner-sourced supplier. Founded in Qingdao, China, QSC has grown into one of the most recognized peptide suppliers in the global research community, serving laboratories and distributors in over 100 countries.

Dual Sourcing Model

Core peptides are produced in-house from raw amino acid starting materials through solid-phase peptide synthesis (SPPS), preparative HPLC purification, mass spectrometry verification, and lyophilization. QSC also partners with rigorously vetted manufacturers — all partner products undergo the same QSC quality control pipeline.

Distribution

Domestic warehouses in USA, EU, UK, Canada, and Australia. International shipping via China warehouse for all other countries. Free shipping on all orders.

Contact

Email: [email protected]
Store: qscpeptide.com