Peptides Certificate of Analysis (COA)
What a Certificate of Analysis is
A Certificate of Analysis, usually shortened to COA, is the document that travels with a finished batch of a research compound. It records what that batch was tested for, the method used for each test, the result obtained, and the limit the result had to meet. It is the paperwork that lets a researcher confirm the vial in front of them is the material described on the label before it enters a study.
A COA is a report about a material. It is not an instruction for use, and it does not establish that a material is safe or suitable for any use in a person. Everything Heritage Bio Labs supplies is offered for research use only and is not for human or veterinary use.
Certificates at Heritage Bio Labs
Every batch is issued with its own Certificate of Analysis, and each certificate identifies the specific batch it describes — the compound, the strength per vial, the lot number, the date of analysis, and the screening carried out on that batch, including endotoxin.
Nothing is carried forward from one batch to the next. A certificate describes the lot printed on it and only that lot, which is why batch and expiry fields on our bottle labels are completed when a batch is actually produced rather than in advance.
This page is where published certificates are posted as they are prepared for each batch. Nothing is listed here until a real certificate exists for that batch, so the page stays a truthful record rather than a placeholder.
How to read a COA
Layouts differ between laboratories, but the fields below appear on most peptide certificates. Reading them in this order takes you from “is this the right material” to “does it meet the specification it claims”.
- Analyte / test item
- The material the report describes. On a peptide certificate this is the named compound or blend, not the finished product in a vial.
- Lot or batch number
- The single manufacturing run the certificate belongs to. A certificate is only valid for the lot printed on it, so the lot on the paper and the lot on the label must match.
- Manufacture and expiry or retest dates
- When the material was made and until when the reported results stand. After a retest date, a fresh analysis is needed for the certificate to remain current.
- Appearance
- A description of what the material looks like, such as a clear colourless solution or a white lyophilised powder, checked against the expected form.
- Identity
- Confirms the material is the compound claimed, most often by comparing measured mass or chromatographic behaviour with the expected compound.
- Purity or assay
- How much of the measured material is the target compound, reported as a percentage with a specification limit, and usually separated from related substances or by-products.
- Concentration or content per container
- The amount of compound present in each vial or container, which is the figure used for any downstream dilution arithmetic.
- Endotoxin
- A measurement of bacterial endotoxin carried over from the manufacturing process, typically reported in units per container or per millilitre.
- Sterility or bioburden
- Whether the batch was tested for living contamination, and by which method. A blank or missing entry here means no sterility claim can be made for that batch.
- Result or disposition
- The final determination for each line — passed, failed, not detected, or not tested — along with the analyst or laboratory that signed it off.
Two habits matter more than any single number. First, check that the lot on the certificate matches the lot on your vial — a certificate for a different lot tells you nothing about your material. Second, read the specification limit beside each result rather than the result alone, because a figure without its limit cannot be judged.
Request the certificate for your order
Certificates are issued with the batch they describe. To receive the certificate for a specific order or lot, email info@heritagebiolabs.com with your order number and the lot number printed on the vial, and we will send the certificate for that batch.
Please include the lot number. Without it there is no way to match a request to the batch that was actually analysed, and a certificate issued for the wrong lot is worse than no certificate at all.
One batch, one report
Each certificate belongs to a single lot and is never reused across batches.
Methods named, not implied
A useful certificate states how each line was measured, not just the figure.
Research use only
Certificates describe materials for laboratory investigation, not for use in people.
Questions about a specific compound, batch, or certificate line are always welcome at info@heritagebiolabs.com. We can talk about what a result means for your laboratory work, but we cannot advise on use in a person.