The practical answer
A usable vial label shows at least the product name or code, a lot or batch number that matches the certificate, the stated quantity, the storage condition, and a retest or expiry date if one is assigned. ICH Q7 and the US GLP rule for test articles both list these fields. If a field is missing, record the gap in the receiving record, photograph the label and ask the supplier; never write over or remove the supplier label. [1] [2] [3]
Evidence, method & source dates ↓Why the label matters more than the website
The vial label is the only document physically attached to the material. The certificate and invoice describe a lot; the label is what tells you that this container belongs to that lot. If the label and certificate do not share a lot number, the certificate does not describe the vial in your hand.
Two reference frameworks list what a container label should carry. ICH Q7, the GMP guide for active pharmaceutical ingredients, says labels should indicate the name or identifying code, the batch number and storage conditions where critical, and, when material leaves the manufacturer's control, the manufacturer's name and address, quantity of contents, special transport conditions and any expiry or retest date. [1] The US Good Laboratory Practice rule for test articles says storage containers should be labelled with name, chemical abstract or code number, batch number, expiration date if any, and storage conditions where appropriate. [2] Research suppliers may follow neither; use the lists as a checklist, not as proof of non-compliance.
Field-by-field checklist
Check each field on the label, then find the same field on the certificate and the invoice. A field is satisfied only when all three agree or the absence is explained.
| Label field | Reference | Match it against | Common problem |
|---|---|---|---|
| Product name or identifying code | Q7 9.42; GLP 58.105(c) [1] [2] | Certificate product name; invoice line item | Trade nickname on label, systematic name on certificate |
| CAS or code number | GLP 58.105(c) [2] | Certificate identifier; supplier catalog | Missing on label; present only on website |
| Lot or batch number | Q7 9.42; GLP 58.105(c) [1] [2] | Certificate lot; packing slip | No lot on vial, or a different format from the certificate |
| Quantity of contents | Q7 9.43 [1] | Invoice quantity; certificate basis | Mass stated without saying gross powder or net peptide |
| Storage condition | Q7 9.42; GLP 58.105(c) [1] [2] | Certificate or supplier storage statement | No condition on vial; condition only on a web page |
| Retest or expiry date | Q7 9.43 (label and/or certificate) [1] | Certificate date fields | No date anywhere; or certificate date mistaken for expiry |
| Manufacturer or supplier name and address | Q7 9.43 [1] | Invoice seller; certificate issuer | Reseller name only, no manufacturer |
| Use restriction | Supplier terms | Website and invoice wording | Research-use-only statement absent from the vial |
Receiving the container
ICH Q7 says each container should be examined on receipt, before acceptance, for correct labelling (including correlation between the supplier's name for the material and your in-house name), container damage, broken seals and evidence of tampering, and held in quarantine until it has been examined or tested and released. [1] It also says each container or batch should be given a distinctive code, batch or receipt number used to record its disposition. [1]
The GLP rule for test article handling asks for procedures that maintain proper identification throughout distribution and document the receipt of each batch. [4] For a research lab, the practical result is the same: one receipt number per container, cross-referenced to the supplier lot.
How to annotate a non-conforming label
Do not write on, cover or remove the supplier label. OSHA's laboratory standard says employers shall ensure that labels on incoming containers of hazardous chemicals are not removed or defaced. [3] Whether or not a given peptide is classed as hazardous, the original label is evidence and should stay intact.
Record the problem in the receiving record instead. A defensible entry names the field, what was expected, what was seen, and the next action. Example, with fictional details: "Vial label shows product name and 10 mg; no lot number. Certificate lot A123 cannot be linked to this vial. Photographed label (file R-0412-1). Container held in quarantine. Requested lot confirmation from supplier on 29 Oct 2026." [1]
If you add an internal label, put it where it does not obscure supplier text, and show only your receipt number and status. Keep the status (quarantine, released, rejected) in the record, not in handwriting that cannot be traced.
- Photograph every face of the label before opening the outer packaging further.
- Record the label text exactly as printed, including spelling and units.
- Mark the container status in your system as quarantine until the gap is resolved.
- Send the supplier one written question per missing field and file the reply with the certificate.
Common omissions and what they cost you
| Omission | What you cannot prove without it | Ask the supplier for |
|---|---|---|
| Lot number | That the certificate describes this vial | Written lot confirmation for the order and container |
| Storage condition | That your storage matches the supplier's basis for any date | The condition the retest or expiry date assumes |
| Date | Whether the material is within its stated period | Retest or expiry date and the stability basis [1] |
| Quantity basis | Whether 10 mg means powder or peptide content | Whether the label mass is gross or net, and the net content result |
| Manufacturer | Who made the material, if the seller is a reseller | Original manufacturer name and original certificate |
Mismatches between label, certificate and invoice
A lot number that differs by one character, a product name in a different form, or a quantity in different units are all common. None of them proves a problem, and none should be silently corrected. Write down both versions, ask the supplier which is right, and keep the reply. If the supplier issues a corrected document, file it alongside the original rather than replacing it.
Where the label is complete but the certificate is for a different lot, the vial has no certificate. Record it that way until a lot-matched certificate arrives.
Questions before you decide
Is a vial without a lot number unusable?
This site does not decide usability. Without a lot number you cannot link the vial to a certificate, so record the gap, hold the container and ask the supplier.
Can I relabel a vial with my own label?
Add an internal receipt label without covering the supplier label. OSHA requires that labels on incoming containers of hazardous chemicals not be removed or defaced.
Should the expiry date be on the label or the certificate?
ICH Q7 says an expiry date should appear on the label and certificate, and a retest date on the label and/or certificate.
Check the underlying evidence
Sources & review dates
- ICH Q7: Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients (Step 4, 10 November 2000) ↗Accessed 29 Oct 2026
- 21 CFR 58.105: Test and control article characterization (Legal Information Institute) ↗Accessed 29 Oct 2026
- OSHA 29 CFR 1910.1450: Occupational exposure to hazardous chemicals in laboratories ↗Accessed 29 Oct 2026
- 21 CFR 58.107: Test and control article handling (Legal Information Institute) ↗Accessed 29 Oct 2026
Sources are documentary evidence. They do not establish firsthand testing of a listed supplier.