How to read a peptide COA and HPLC result.
Start with the sample and batch. Read the percentage after you know which product the report describes.
By Peptide Doctor editorial team · Updated
A certificate of analysis, or COA, records analytical results for a sample. HPLC is a separation method used in some of those analyses. To assess a report, match the product and batch, identify the laboratory and test date, then read the method, results and any stated limitations.
Match the report to the product
Find the sample description and batch or lot number. Compare them with the seller's listing and the label on the vial. A document with a similar product name but no link to your batch leaves that connection unresolved.
Record the laboratory name, report identifier and issue date. If the seller only provides a cropped result, request the complete report so you can see the context and any notes.
Read the HPLC result in context
High-performance liquid chromatography separates components under the conditions of the stated method. The report may use the detected peaks to calculate a purity figure. The method and how the result was calculated matter.
A percentage alone is not the complete analysis. Look for the chromatogram, sample identity, detection method and the laboratory's explanation of the result. Ask the laboratory or supplier to clarify an unexplained calculation.
Separate purity, identity and quantity
These are different questions. A purity result does not automatically confirm the amount of material in a vial, the identity of every component, or that the sample represents every vial in a batch.
Look for the specific tests supporting each claim. If a seller claims identity testing, quantity or sterility, the supporting report should identify the relevant test rather than relying on an HPLC percentage to answer everything.
Check a report you already have
Use the Peptide Checker COA guide alongside the complete document. For PEPTIDE LAB products, search the exact batch ID on its quality page and compare the returned product details.
If the laboratory publishes a report-verification service, reach it through the laboratory's own website. A successful document or database lookup confirms a record; it does not test the contents of the vial in your hand.
Straight answers
Does 99% purity mean a product is safe to use?
No. A purity result does not establish sterility, clinical safety or suitability for an individual. Those are separate questions.
What if the COA batch does not match the vial?
Ask the supplier for the report associated with the exact batch. Do not assume a report for a different batch applies to your vial.
Should I accept only a screenshot of the result?
Ask for the full document. A cropped image may omit the sample description, methods, date, report identifier or limitations needed to interpret the result.
What has to be visible before I pay?
Price, batch ID, COA, HPLC result, payment method, dispatch origin, and support. If those are hidden, slow down.
Is Peptide Doctor medical advice?
No. Peptide Doctor is not a clinic, pharmacy, prescriber, or medical service. Medical questions belong with a qualified practitioner.
What should I check about payment?
Read the payment methods and dispute terms available at checkout. Keep the receipt and order number. Protection depends on the provider, transaction and terms; a logo alone is not a guarantee.
Sources and product records
Research peptides are not approved by the TGA for human use. Product links are for checking what is visible before payment, not medical advice.