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Better Questions.
Clearer Sourcing Decisions.

Ideas and practical guidance on API sourcing,
specifications and supplier documentation.

Explore The Insights

Explore The Knowledge Library.

Practical reading for your next sourcing conversation.

3 reading resources
Pharmaceutical laboratory brand illustrationBrand illustration
API SourcingSample Article

A Clearer Start To Your API Sourcing Inquiry.

Prepare the material identity, specification, documentation and delivery details that help make an API sourcing conversation more useful.

Ryan · CEORead Article
SpecificationsQuick Guide

Comparing API Specifications.

Review material forms, assay basis, impurity limits and test methods before comparing quotations.

Procurement notes
DocumentationQuick Guide

Reviewing Supplier Documents.

Keep manufacturer identity, batch references and technical documentation connected during supplier evaluation.

Procurement notes

Turn Your Questions Into a Conversation.

Tell us the API, specification and target market you’re working with.

Discuss Your Requirements

Preparing an API RFQ

Identify the material by its full name, salt or hydrate form, and CAS number if available.

Include your required specification or pharmacopoeial standard, estimated quantity, destination market and preferred timeline.

List the documents you need for your internal review. Ask the supplier to confirm source, sample availability and commercial terms before you proceed.

Discuss your requirements

Comparing specifications

Compare the same material identity, salt form and specification version across quotations.

Review the stated assay basis, impurity limits, water content and particle-size requirements with your technical team.

A lower unit price does not by itself establish equivalence. Confirm test methods, packaging, delivery terms and which documents relate to the proposed batch.

Discuss your requirements

Reviewing supplier documents

Start with a specification, a relevant certificate of analysis and a safety data sheet, subject to availability.

Check that manufacturer identity, material identity, batch number and document dates are consistent. Request clarification where information is incomplete.

Regulatory files and site certificates relate to particular sources and markets. Their applicability must be confirmed for your request; this website does not imply that any specific registration is available.

Discuss your requirements

Catalog & documentation

The supplied PDF is a Curia catalog for reference. It is not ZHITUO’s catalog and does not establish ZHITUO’s supply scope, authorization or certifications.

Download Curia reference PDF

For ZHITUO product information, please tell Alan the API and documentation you require.

Request product information

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Terms of Use

This homepage is a local business preview. Content is introductory and does not constitute a binding offer or a guarantee of product availability, grade, documentation or market eligibility.

Specifications, source, samples, documentation, price and delivery terms are subject to confirmation for each inquiry. Images are brand illustrations. The cartoon is a brand avatar, not a photographic representation of a company officer.

The reference catalog remains attributed to Curia. No manufacturing ownership, authorization or regulatory status is implied.