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The 6 documents to ask for before you trust a vial

This checklist is about paperwork, not use. It does not tell you what to do with any compound. If a vendor can't produce a document, write "not on file" — that's a result too.

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The checklist

#DocumentWhat it provesWhat it does not proveWhere to find it
1Lot IDWhich batch you have. Links the vial to a specific test.Anything about quality by itself.On the vial label, on the product listing, on the certificate. All three must be the same string.
2Certificate of Analysis (COA)What the lab measured for that lot: identity, purity, sometimes contamination.That the PDF is real. That it applies to any other lot.Product page, usually a "View COA" link per lot.
3Lab lookup matchThe certificate exists in the lab's own database and matches the vendor's PDF. This is what makes #2 real.—The lab's public lookup page. Enter the search code from the certificate.
4Identity confirmedThe molecule in the vial is the one on the label (LC-MS or equivalent).Purity, safety, or effect.The "Identity" line on the certificate. Matters most for names that mean two things (e.g. "TB-500").
5Purity + method + net contentHow much of the powder is the named molecule, by which method, and how much was in the vial.A product-level number. Purity is per lot. A listing's "≥99%" is a claim, not a measurement.Certificate. For blends, one number per component or the ratio is unverified.
6Who you're dealing with + regulator status, datedThe legal entity (state registry), and the compound's FDA / WADA status on the day you checked.That the vendor is good. That the status won't change.State business registry · FDA 503A bulk-substances page · WADA Prohibited List.
Nice to have, not on the six: endotoxin screen (LAL, method named) · a named chemist's signature · a certificate format that carries the vendor's lot, not just the lab's accession number.

The 5-minute lookup

  1. Open the COA PDF for the lot you have.
  2. Copy the search code (top-right block on Freedom Diagnostics certificates: "Pept" + accession number).
  3. Paste it at the lab's public lookup — the lab's site, not the vendor's.
  4. Compare the lab's copy to the vendor's PDF: lot, dates, numbers. Identical, or it isn't verified.
  5. Write down lot · search code · date checked. That's your record.

If the lookup returns nothing: don't "fix" the code. Don't cite numbers from that file. Mark it unverified and ask the vendor. Worked example: how to read a peptide COA.

Three lights

Verified — the lab's database returned the same document.
Unverified — a document exists but the lab couldn't find it, or something doesn't match.
Nothing on file — no document to check. Write that down too.

Words that should make you slow down

"Pharmaceutical grade" · "clinically aligned" · "99%+ purity" on a listing (not a lot) · "USA-made" with no document · "third-party tested" with no lookup · any page that tells you what a research compound will do for you.

Your record

ProductLotSearch codeLab lookupIdentityPurity / methodDate checkedLight
   ☐ found ☐ not found   ●
   ☐ found ☐ not found   ●
   ☐ found ☐ not found   ●
Lots we have already checked, with lab links: the public check log.
free · one per person · we run 10 a week

Want us to check one for you?

Paste a product link or a lot number. We pull the lab report, look it up at the lab, and reply personally within 48 hours with the three lights. Any vendor. Research use only.

You don't need to understand chemistry to check paperwork.
Research use only. Not for human consumption. Products referenced on this site are sold by the vendor as research chemicals. Nothing here is medical advice, a recommendation to use any compound, or a substitute for a licensed professional.
Affiliate disclosure. Two vendors appear on this site. Peptide Restore, LLC (Utah): links marked “Affiliate link” carry our discount code — it takes 5% off at the vendor's checkout and the vendor pays us a commission on the order. Capstone Peptides (Capstone Holdings LLC): links marked “Affiliate link” are referral links and we earn a commission if you order through them. We do not sell, ship, or handle any product. The same documentation standard applies to every vendor, including both we link to.
Vendors: Peptide Restore, LLC (Utah) — not affiliated with Restore Peptides (New Mexico) · Capstone Peptides (Capstone Holdings LLC). Vendor statements about origin are not independently verified. · COA lab on file: Freedom Diagnostics · Editor: Chas Dearie · Last reviewed: 30 Sep 2026