Quality Standards
We don't ask you
to trust us.
We give you proof.
Every batch is HPLC tested by an accredited third-party laboratory. Every certificate is published. If a compound fails the 99%+ purity floor, it doesn't make it onto the site — the supplier eats the cost.
99%+
Purity floor
3rd-party
Tested
Every batch
No exceptions
60-day
Guarantee
What we promise
Four standards we don't compromise on.
01
99%+ purity, verified
Every compound meets or exceeds 99% purity by HPLC area %. The lab signs the report. If a batch comes back at 97%, we don't list it — it goes back to the supplier.
02
Independent third-party labs
We never test our own product. Samples ship to accredited laboratories that have no commercial relationship with us beyond the testing fee. Their name and contact info is on every CoA.
03
Full batch traceability
Every vial carries a lot number that ties to a specific Certificate of Analysis. Match the number on your vial to the PDF in our public library. Same vial, same batch, same paper trail.
04
60-day no-questions guarantee
If your order shows up damaged, lost, or you simply aren't satisfied, we replace or refund within 60 days of delivery. No request for a return, no friction. We stand behind every batch.
The Test
What HPLC actually shows.
High-Performance Liquid Chromatography (HPLC) is the gold standard for peptide purity. It separates a sample into its components and graphs them by retention time. A pure peptide produces one tall, narrow peak. Impurities show up as smaller side peaks. Here is what a 99%+ pure sample looks like:
Illustrative trace · target peptide at 7.2 min
The number above the tall peak is the area-percent purity reported by the lab. We publish the actual trace — not a stylized graphic — for every shipped batch in the Certificate library.
The Document
Inside a Certificate of Analysis.
A real CoA is a one- or two-page PDF. Here's what each field means and which ones you should actually care about.
Purity Percentage
The number that matters mostReported as 'Area %' from the HPLC trace. Anything below 99% gets rejected. Most legit batches land between 99.0 and 99.9%.
Lot / Batch Number
Match to your vial labelA unique identifier for the synthesis run. Every vial in a batch shares the same number. If your vial's lot doesn't match a published CoA, ask us — don't assume.
Test Date
Should be recentWhen the lab ran the analysis. Older than ~12 months is a yellow flag for any peptide that's been sitting in inventory. Our batches are typically tested within weeks of arrival.
Lab Name + Address
Verifies independenceThe third-party lab that signed the report. Look up the name — they should be a real laboratory with a website and a publicly listed address. We use Janoshik, Ascend Analytical, and others.
Mass Spectrometry
Confirms identityHPLC tells you 'this is pure.' MS tells you 'this is the right molecule.' A real CoA pairs them. The reported molecular weight should match the peptide's known MW within ~0.1 Da.
Endotoxin / Sterility
For sterile applicationsSome labs report endotoxin levels (must be <1 EU/mg) and sterility for compounds intended for reconstitution. Not always present on every CoA — varies by compound and intended use.
Chain of Custody
From synthesis to your bench.
Synthesis
Compounds are made at cGMP-compliant peptide facilities using solid-phase synthesis. Every kilogram is lot-tracked and sealed at the source.
Manufacturer QC
The supplier runs internal HPLC + MS before release. Their CoA travels with the shipment as the first line of evidence.
Independent re-test
On arrival at our facility, a vial from each batch is pulled and shipped to a third-party laboratory we have no commercial tie to.
Documentation
The independent lab signs and dates a Certificate of Analysis. We upload it the same day. The CoA matches the lot number on every vial in the batch.
Storage
Lyophilized peptides held in temperature-controlled inventory. Stable at room temp for 30+ days, refrigerated for the long tail.
Fulfillment
Orders ship within 24 hours of payment, in plain unbranded outer packaging. Ice packs included for the few liquid-state SKUs that need them.
Common Questions
Quality, in plain English.
Why third-party testing if the supplier already tested it?
Because the supplier is selling us the product. The whole point of independent verification is that the lab signing the certificate has nothing to gain from a favorable result. The fee is the same whether the batch comes back at 99.5% or 95%.
What happens to a batch that fails?
It goes back. We don't 'salvage' off-spec material, blend it down, or sell it at a discount. The supplier issues a credit and we wait for the next clean batch. This is one of the reasons certain SKUs go on backorder briefly — we'd rather miss revenue than ship 97% material.
What about contaminants — bacteria, endotoxins, residual solvents?
HPLC purity is the headline number, but a complete CoA also reports endotoxin (must be <1 EU/mg), residual solvents (acetonitrile, TFA, within ICH limits), and moisture content (<6% for lyophilized peptides). Our published CoAs include the full panel where the lab provides it.
If something goes wrong with my order, what's the recourse?
60-day no-questions money-back guarantee on every purchase. Damaged in transit? We reship. Not satisfied? Refund. Lost package? We send another. Email support@veridianbio.com with the order number and we'll handle it the same day.
See the proof. Then start the order.
The standards are real. So are the certificates. Browse the live library or jump straight to the catalog.