RED FLAG 01
No per-lot COA
No published Certificate of Analysis for the lot you would receive, or a generic document with no lot number on it. Without a lot-matched COA, there is nothing to verify.
RESEARCH SUPPLY · VERIFICATION GUIDE
Don’t run experiments on unverified material.
Before any order, ask one thing: does the supplier publish a COA for the exact lot you will receive, and does it show purity, identity and contamination testing? This page shows you how to check that documentation yourself, in about two minutes.
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For research use only. Not for human consumption. Not medical advice.
01 / DOCUMENT CHECK
Read the COA before you read the price.
A Certificate of Analysis (COA) is the lab document behind a batch. Open the COA for the lot you are considering and check these three lines first. Tap each line to see what you are looking at.
DOCUMENT CERTIFICATE OF ANALYSISBASIS PER-LOT · LYOPHILIZED
A HPLC purity CHECK 1
High-performance liquid chromatography separates what is in the vial. On the COA, look for the purity line together with its chromatogram. A percentage on its own, with no trace behind it, is not documentation you can verify.
B Mass-spec identity CHECK 2
Mass spectrometry weighs the molecule itself. This line confirms the material in the batch matches the compound named on the label. Identity comes first, before any other number matters.
C Endotoxin screening CHECK 3
Endotoxin screening checks for bacterial contamination that is invisible in a sealed vial. If a COA has no endotoxin line at all, that test was not part of the batch record, so treat the batch as unverified.
Then match the lot number on the COA to the lot number printed on the vials you receive. If the numbers do not match, the document does not describe your material. Sample layout shown for illustration only. Always read the published COA for your specific lot.
02 / CHECKLIST
What a verifiable supplier shows you.
Apply these checks to any supplier, including the one linked on this page. If you cannot confirm a line yourself, treat it as not published.
| Check | What to look for | Warning sign |
|---|---|---|
| Per-lot COA published | ✓ A COA tied to a specific lot number | ✕ Generic or missing COA |
| Testing lab named | ✓ Lab name shown on the COA itself | ✕ “Third-party tested” with no name |
| Endotoxin & sterility lines | ✓ Listed on the batch record | ✕ Not listed |
| Batch numbers on vials | ✓ Lot number matches the COA | ✕ Often missing |
| Physical US address | ✓ Published and contactable | ✕ Not published |
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03 / WALK-AWAY SIGNALS
Four red flags. Any one ends the order.
These are the same checks from the table above, stated as stop signs. If a supplier fails one, no lower price is worth the unverified material.
RED FLAG 02
Testing lab not named
“Third-party tested” with no lab name is a claim, not evidence. Look for the testing lab named on the COA itself.
RED FLAG 03
No endotoxin or sterility lines
Purity alone does not cover contamination. If endotoxin screening and sterility are missing from the batch record, the batch was not checked for them.
RED FLAG 04
No address, no support contact
No physical US address and no stated way to reach a person. A supplier you cannot locate or contact cannot answer for its documentation either.
04 / THE CHECKLIST
Tests worth looking for on a COA.
One line each. Use this as a checklist to hold any supplier to, and confirm each item on the published COA for your lot.
01
HPLC purity
Chromatography that separates the batch contents so purity is measured, not asserted.
02
Mass-spec identity
Mass spectrometry confirming the material is the compound named on the label.
03
Peptide content
Quantifies how much of the vial contents is the named peptide material.
04
Endotoxin screening
Checks the batch for bacterial endotoxin contamination.
05
Sterility
Confirms the batch record includes a sterility check.
06
Heavy metals
Screens the batch for heavy-metal contamination.
05 / QUESTIONS
Frequently asked questions.
What is a COA?
A COA is a Certificate of Analysis, the lab document for a specific batch or lot. Before ordering, open the COA for your lot and check the HPLC purity, mass-spec identity, and endotoxin lines, then match the lot number on the document to the lot number on your vials.
What about shipping and pricing?
Shipping options, costs and current prices are set by the supplier and can change. Check the supplier’s own site at checkout for current terms.
What does code MYKEL10 do at checkout?
MYKEL10 is the coupon code for this page. Copy it with any code chip on this page, then enter MYKEL10 in the coupon field at checkout on Instant Peptides. #ad. Ordering through the links on this page earns me a commission at no extra cost to you.
Are these products for human use?
No. For research use only. Not for human consumption. Not medical advice. This page covers supplier documentation and verification only.
Verify first. Then order with the document in hand.
Open the published COA for your lot, check the three lines in Section 01, and match the lot number when your vials arrive. That is the whole standard, and it takes about two minutes.
#ad. Affiliate link. I earn a commission at no extra cost to you.Enter code MYKEL10 at checkout. For research use only. Not for human consumption. Not medical advice.