Buying Peptides Online: A Documentation Checklist for Labs
For in vitro laboratory research use only. This guide covers purchasing documentation only. It is not a guide to using any material, and Peptix makes no claims about the effects of any material it sells.
When a laboratory buys peptides online, the purchase record matters as much as the material. Good documentation lets you trace each vial back to a tested lot, answer questions from a reviewer or auditor, and spot problems before material goes into a study. This checklist covers what to request, what to record, and the generic red flags worth noticing.
What to request before you order
Ask for, or look up, these items for every product:
- The Certificate of Analysis (COA) for the current lot, as a full report, not a cropped image or a summary.
- The lot number the certificate applies to.
- The report date, so you know when the testing was done.
- The name of the testing laboratory, ideally an independent third party.
- The methods used: HPLC-UV for purity and LC-MS for identity are the common pair.
- A way to verify the report, such as a search code you can enter on the lab’s own website.
A supplier that publishes this information openly saves you the request. On Peptix, all six items for current lots are on the peptide COA lookup page.
What to check when the order arrives
- Read the lot number on each vial label or box.
- Find the same lot ID on the supplier’s COA list.
- Open the certificate and confirm the lot number printed on it is identical, character for character.
- Note the labeled amount on the vial and the measured net content on the certificate. These can differ: the certificate states what the lab measured in the vial it tested.
If a lot on your vial is not listed, or does not match, contact the supplier with your order number and the lot number before using the material.
What to record in your lab files
Keeping a simple record for each order makes later review much easier:
| Field | Example |
|---|---|
| Product and labeled amount | BPC-157, labeled 10 mg |
| Lot ID | BC-20260521-01 |
| Testing lab | Freedom Diagnostics |
| Report date | July 8, 2026 |
| Purity result and method | 99.26%, HPLC-UV |
| Identity result and method | BPC-157, LC-MS |
| Date received | your receipt date |
| Storage location | your freezer or refrigerator ID |
Save a PDF copy of the certificate with the record, not just a link, so the file survives if a web page changes.
Generic red flags
None of these prove a problem on their own, but each is worth a question before ordering:
- A lot number on the vial that does not match any certificate
- A certificate with no named laboratory
- No report date, or a report much older than the current lot
- A purity percentage with no identity result
- One certificate used for several different products
- No way to confirm the report with the laboratory
- Product pages that describe uses outside the laboratory
Current Peptix lots
| Product | Lot ID | Purity (HPLC-UV) | Identity (LC-MS) | Measured net content per COA |
|---|---|---|---|---|
| BPC-157 10 mg | BC-20260521-01 | 99.26% | BPC-157 | 12.71 mg (labeled 10 mg) |
| TB-500 10 mg | TB-20260521-01 | 99.79% | thymosin beta-4 | 12.15 mg (labeled 10 mg) |
| BPC-157 / TB-500 20 mg | BB-20260521-01 | 99.15% | BPC-157 and thymosin beta-4 | 13.68 mg BPC-157 + 11.17 mg thymosin beta-4 (labeled 10 mg + 10 mg) |
Source: the Peptix COA page, Freedom Diagnostics reports dated July 8, 2026. A certificate reports results for the sample tested. It is not a guarantee for other lots.
You can see every current product on the Peptix shop page, including TB-500 10 mg, each with its lot certificate on the COA page.
Frequently asked questions
What documents should I get when buying peptides online?
Get the Certificate of Analysis for the current lot, the lot number, the report date, the name of the testing laboratory, the methods used, and a way to verify the report with the lab.
Why does the lot number matter?
The lot number ties a vial to a specific certificate. A certificate reports results for the sample tested. It is not a guarantee for other lots.
Why can the measured net content differ from the label?
The certificate states the amount the lab measured in the vial it tested. It can differ from the labeled amount stated on the product label.
What if my vial’s lot is not on the COA page?
Contact Peptix support with your order number and the lot number before using the material.
For research use only. Not for human or animal use.
