Manufacturing and Quality
What Documents Should Supplement Buyers Ask For?
Document Due Diligence Guide · 4 min read · Published 2026-09-04 · Updated 2026-10-11
Ask for documents that answer a specific question about the supplier or product. A facility certificate, a product specification and a batch report do different jobs; collecting all three is useful only if you know what each covers.
Start with the proposed company, production site, format and destination market. Then request the records appropriate to the stage of the project.
Match the request to the project stage
During supplier selection, ask about identity, site and relevant quality-system records. When defining the product, review specifications, ingredient information and label drafts. For a production-batch decision, request the agreed batch-linked records.
A new development project will not yet have results for its future production batch. Ask which evidence exists now and which work is planned. Agree how confidential records can be shared, redacted or reviewed.
Facility, product and batch documents
| Document | Question it answers | Check |
|---|---|---|
| Company and site information | Who is involved and where? | Legal name, address and role in the proposed work |
| Certificate or audit record | Which activities has the issuer assessed? | Issuer, named site, scope, exclusions and dates |
| Quality-system procedure | How is the activity controlled? | Version and relevance to the work being discussed |
| Specification | What requirements apply? | Item identity, revision, units, methods and acceptance limits |
| Ingredient records | Which material is proposed? | Supplier, identity, lot or specification reference |
| Test report or COA | What result was reported? | Sample or lot, method, result, units, limits and date |
| Pack and label files | Which version will be used? | Component, language, market and approval status |
| Batch and release records | How was the identified batch reviewed? | Batch reference, specification, deviations and disposition |
Read a COA beside the specification
A specification states the requirements. A certificate of analysis, or COA, reports results for an identified material or lot. Compare the result with the applicable method, units and acceptance limit.
An ingredient COA does not report the content of the finished supplement. If a report identifies raw material, ask for the connection to the finished-product specification and the verification work planned for production.
For applicable US supplement operations, the FDA CGMP guide discusses component, laboratory and batch records. The current regulation is the legal reference.
Review the label for its destination
Check the formula version, directions, language and intended market on the label draft. A representative label or an early artwork file is different from the version approved for your product.
The FDA labeling guide is a US reference that needs to be read with current requirements. The European Commission overview gives EU context; identify the destination country and its applicable requirements during review.
A field checklist for each document
| Field | What to record |
|---|---|
| Identity | Title, reference number and issuing organization |
| Subject | Named company, production site, product or batch |
| Scope | Covered activities, product category or tests |
| Version and dates | Revision, issue date, test date and validity where applicable |
| Results | Method, units and acceptance limits for the identified sample |
| Project match | How the file relates to the proposed product and market |
| Follow-up | Reviewer, unanswered question and person responsible |
A useful follow-up is: “This report identifies the raw ingredient. Which specification and results cover our finished product?” Ask for the missing relationship rather than assuming the file is irrelevant or sufficient.
Questions buyers often ask
Which documents should I ask for first?
Start with the company, proposed site and relevant scope. Then ask for specifications and records that match your current product decision.
Does a COA prove the product is compliant?
A COA reports particular results. Product and market review also need the relevant specifications, label, methods and other required records.
Send a document request with the brief
List the records you need and the decision each should inform. Use the supplier evaluation guide for the wider comparison, or send your document requirements with the product brief.