Start with the responsible entity
When reviewing a peptide source in China, identify the legal entity handling your enquiry, the scope it accepts and the party responsible for each document. A website name and a facility photograph do not establish this relationship by themselves.
The useful question is which entity stands behind the particular material, document and commercial commitment. Record that relationship in the project correspondence.
Separate reference information from a commitment
A catalog is an introduction to possible project discussions. It should not be read as proof of stock, a universal purity grade or authorization for a destination. Review the specification and institutional context before considering commercial terms.
Make the review comparable
Ask each prospective partner for the same information: material designation, applicable specification, document issuer, batch identification approach and review responsibilities. This makes a comparison between Chinese peptide sources more meaningful than comparing slogans.