First PO checklist
Material, quantity, batch evidence, payment, delivery and quality acceptance.
Procurement resources
Prepare a better purchasing decision.
Use these practical checklists before a first order, supplier review or sample test.
Buyer checklists
Choose your next question.
Reading a COA
Check the issuer, identified sample, methods, results and relationship to the offered lot.
Testing before bulk
Define the analytical question, proposed sample and decision the report should support.
OEM project brief
Define material, scale, packaging, confidentiality and sample acceptance.
Existing educational guides
Browse the procurement knowledge center.
Existing editorial guide text and primary references are retained. The next-step inquiry supports quotations, samples and document requests.
Research database
Browse all compounds Explore compound research profiles.
Compare identity, research stage and literature context before opening a product or testing discussion.
No profiles match those filters.
Educational research index only. It does not provide dosing, reconstitution or clinical-use instructions. Research status, approvals and literature context must be checked for the specific compound, jurisdiction and date.
Procurement knowledge center
Guides
Use these source-led guides to prepare supplier, documentation and testing questions.
503A vs 503B Peptide API Procurement
503A and 503B are different US compounding frameworks. Their buyers should independently assess legal eligibility, supplier qualifications and lot evidence under the rules applicable to their facility.
Read guide →BPC-157 Analytical Testing Guide
For non-US professional research only, plan BPC-157 testing around sample identity, method purpose and provenance; do not use a “purity” headline as a complete qualification.
Read guide →How to Evaluate Third-Party Peptide Testing
Evaluate the laboratory, requested question, sample custody and issued report before relying on “third-party tested” as a claim.
Read guide →How to Qualify a Peptide API Supplier
Qualify the company, the specific material and the offered lot separately. A catalog listing or COA alone cannot establish all three.
Read guide →How to Source Peptide APIs from China
Treat China sourcing as a traceability and import-control project: identify the actual manufacturer, qualify the material and confirm destination-market requirements before shipment.
Read guide →How to Verify Peptide Identity
Verify identity through an explicit reference identity, suitable analytical evidence and a sample-to-lot trace; a product name on a vial is insufficient.
Read guide →HPLC Purity vs Peptide Content
HPLC peak-area purity describes the share of detected chromatographic response assigned to a peak; peptide content asks how much target peptide is present on a stated mass basis.
Read guide →HPLC vs LC-MS for Peptide Qualification
HPLC and LC-MS are complementary: a chromatographic method can separate and quantify specified signals; mass spectrometry adds mass-related evidence for identity. Neither technique alone answers every release question.
Read guide →Peptide API MOQ Explained
MOQ is the minimum quantity a supplier will accept for a particular quote; it is not a universal product specification or a measure of lot quality.
Read guide →Procurement worksheets
Download blank, editable tables to record the evidence and requirements for your own inquiry.
COA review worksheet
Record issuer, sample or lot, method, specification, result, units and review decision.
Download worksheet →Sample-to-batch traceability
Connect sample, report, offered lot, order and delivered lot identifiers.
Download worksheet →Multi-product RFQ table
List each material, presentation, pack basis, quantity, destination and required files.
Download worksheet →Independent testing of a supplier sample · 503A pharmacy documentation