Where to get peptides tested — and how to choose a lab.

If you buy, sell, or research peptides, sooner or later you need a number you didn't get from the person selling to you. The good news: independent testing is a mail-in service — you don't need a lab in your city or even in your country, you need a lab you can trust with a vial and a tracking number. The hard part is telling a real analytical lab from a rubber stamp. Here's how.

(Yes, we are one of the options — KMD Analytical is an independent RP-HPLC lab in Chatsworth, California. This guide is written so you can hold any lab to it, including us.)

The short answer

You get a peptide tested by mailing one sealed vial to an independent analytical lab. A sound lab sends back three results — identity, purity, and the milligrams actually in the vial — on a certificate that anyone can verify. Where the lab is matters less than how it answers the seven questions below.

The seven questions that expose a weak lab

Ask these before you send a sample. Each has an answer you can check.

Put all seven in one email. A real lab answers in a few lines. If a lab will not answer, treat that as the answer.

How mail-in testing works, step by step

Order first, ship second. This is the sequence at our lab; a sound lab anywhere should follow something close to it.

1. Place the order. On the order form, enter one line per vial: compound, labeled mg, and your lot number if you have one. Give the company or brand name the certificates should carry, because a sealed certificate cannot be edited later. The form shows your exact total before you pay.
2. Pay the invoice. Testing starts only on a paid order. Once it is paid, the shipping address and packing steps arrive by email.
3. Label and pack. Write your order number on the outside of the package. Label each vial with its compound and strength, and mark identical vials 1 and 2. Send sealed vials only, padded so they cannot move. The full list is on the submission page.
4. The lab logs the box in. Each vial is matched to your order and photographed as it arrived. The turnaround clock starts that day, not the day you paid. You get an email with a tracking link that shows your order's progress.
5. The analysis runs. Each vial is prepared and run by HPLC against a certified reference standard (a characterized reference material where no certified standard exists). That gives identity, chromatographic purity, and net-peptide content in mg. A blend gets all three for each active the method can separate.
6. A person signs the certificate. The analyst reviews each result and signs the certificate before it is sealed.
7. Results arrive per vial. Each certificate is emailed as a sealed PDF when that vial is done, typically within 5–7 business days of receipt (7 business days maximum). You, or anyone you send it to, can check it at /verify.

Each stage is covered in more depth in how third-party testing works.

What a good certificate must contain

A certificate is useful only if a stranger can read it and check it. Look for these on any lab's COA:

• A certificate number and the lab's name, so the document can be looked up on the lab's own website.
• What was submitted, as labeled: compound or product name, label claim in mg, your lot number, and the name of whoever sent it.
• Dates: received, analyzed, issued.
• A photo of the vial as it arrived.
• Three separate results: identity against a reference standard, purity as area %, and content in mg per vial beside the label claim.
• The specification and a plain verdict: what each result was judged against, and whether the sample conforms or does not conform. A failing certificate should carry the same detail as a passing one.
• The chromatogram, the trace the numbers came from.
• A signature and a way to verify: who authorized it, plus a certificate ID or QR code that leads to the lab's own record, and a hash that proves the file is unchanged.
• What was not tested, stated on the page.

Our sample certificate shows where each printed item sits. The hash is not printed on the page; it is checked at /verify. To read the numbers, see how to read a peptide COA. If you already hold a certificate from any lab, verify it before you rely on it. If any of the nine is missing, ask the lab why.

What an independent lab cannot tell you

A lab result is narrow on purpose. Know where it stops.

• It covers the vial you sent, not the whole batch. The result describes that one vial as it arrived. It is not a statement about other vials, the rest of the lot, or the product as sold.
• It cannot confirm where a vial came from. The label claim and lot number on a certificate are printed as the submitter gave them.
• It says nothing about what was not measured. An HPLC certificate reports identity, purity and content. It does not report sterility or heavy metals unless those tests were run and are printed on it; an endotoxin result, when ordered, is issued on its own certificate.
• It is not a statement about safety or use. A certificate reports analytical findings. It does not find that a product is safe or fit for any purpose.
• It does not judge how a product was made or handled. The lab sees one vial, not the manufacturing, sourcing or storage behind it.

A certificate also cannot settle a disagreement between two labs. Different methods, reference standards and vials give different numbers, so ask each lab how it reached its figure. A lab that implies one certificate covers everything above is overselling.

The honest limits of our lab

Hold us to the same standard. KMD Analytical tests by HPLC with diode-array (UV) detection, and that sets what we can report. The full statement is on our scope page; the plain facts about the lab are on lab facts.

• We do not run mass spectrometry. Identity is a retention-time and UV-spectral match against the reference standard.
• We do not test heavy metals, sterility, or aggregate and dimer content. Referrals are available. Bacterial endotoxin (USP <85>, LAL) is offered as a $150 per-vial add-on, reported on its own certificate.
• We do not accept controlled substances of any schedule, somatropin (human growth hormone), testosterone, anabolic-androgenic steroids, or SARMs. Material outside our scope is returned or destroyed without analysis, and analytical fees are not refunded.
• We are not a clinical laboratory and we do not test human or animal specimens. We are not FDA-registered and we do not perform GMP release testing.
• Some blends cannot be separated reliably by our method. Send us the compound list before you ship and we will confirm what we can quantify.
• A peptide outside our current panel needs advance notice, so we can source its reference standard first.
• Tested vials are not sent back. Any remainder is held briefly for re-runs, then disposed of.

What it costs, and how to compare quotes

For reference, our own price for identity, chromatographic purity, and net-peptide assay together is $150 per vial for 1–4 vials, $125 for 5–9, and $100 for 10 or more. Standard turnaround is typically 5–7 business days from receipt (7 business days maximum), and rush (next business day, orders of up to 4 vials) adds 100% to the order total.

When you compare quotes, check that all three results are included. If a price is far lower, ask which result is missing and whether a reference standard is used. If a quoted time is far longer, ask whether the lab runs the sample on its own instrument. Ask for the total in writing, including any charge for blends or rush. Our full schedule is on the pricing page, and the cost guide explains what moves the price.

One vial is the price of a measured result

Testing consumes the sample. That's not a flaw — it's the trade: one vial from the batch, in exchange for a measured number in place of a claim. For anyone selling under their own name, that is a small cost for a result a customer can check.

Selling under your own brand? See testing for brands and sellers. Testing as a group? See group testing. Looking for a lab in California? See peptide testing in California and in Los Angeles County.

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