How to Tell if a Peptide Vendor Is Legit: 8 Checks Before You Order
By Russel Martin · Updated · Editorial policyContains affiliate links. We may earn a commission on purchases. More
A legitimate research peptide vendor can show you who it is, what was tested and what happens if an order goes wrong. These eight checks take about ten minutes and are the same ones we run in every vendor review.
1. A COA for your exact lot
The certificate should name the lab, the lot number and the test date, and the lot should match the vial you receive. Reports grouped only by product or month do not tell you what is in your vial.
2. A lab you can check
"Independent" or "ISO-accredited" with no name is not verifiable. A named lab, ideally one that lets you confirm a report by its ID, is.
3. A company you can identify
Look for a legal entity name, a business address and a phone number on the contact or terms page. Note whether the address matches where orders say they ship from.
4. Policies in writing
Read the refund page and the shipping page. Check what happens to lost, damaged and wrong orders, how long you have to report a problem and what proof is needed. Watch for pages that contradict each other.
5. Payment options that protect you
Card payments usually come with chargeback rights. A vendor that only accepts crypto or bank transfer leaves you with little recourse if an order never arrives.
6. The right domain
Look-alike sites copy the names of known vendors. Type the domain yourself, check it against the vendor's known address, and be careful with redirects to a different domain ending.
7. Reviews outside the vendor's own site
Check Trustpilot and community discussions, and read the review count and dates rather than the star average alone. Posts that end with a discount code are usually affiliate posts.
8. Research-use framing
Legitimate research suppliers sell for laboratory use only and do not give dosing, administration or health advice. A seller that does is not operating as a research supplier.
See how each vendor did on these checks in our vendor reviews.
Frequently asked questions
Is a COA enough to trust a vendor?
Only if it matches your lot. A COA should name the lab, the lot number and the test date, and where the lab offers verification you should be able to confirm the report with the lab.
Is a vendor with a login wall a bad sign?
Not by itself. Some vendors show their catalogue only to registered researchers. It does mean you cannot compare prices or reports before signing up, so ask for them first.
Are Trustpilot ratings reliable for peptide vendors?
They help, but read them with the review count and dates. A high rating from a handful of recent reviews means less than a steady rating from hundreds over time.