Know exactly what's in the vial. Verified in 4 days.
Great Lake Labs specializes in high-precision purity testing for research-use-only peptides, with a turnaround measured in days, not weeks.
Verify a certificate
- Turnaround
- 4 daysSample received to certificate issued
- Methods
- HPLC · ICP-MSPurity, identity, metals, sterility
- Accreditation
- ISO 17025ilac-MRA · PJLA accredited
- Location
- MichiganSamples analyzed in state
What we run
The Full QC Panel, analyte by analyte.
Seven results on one certificate. Order the whole panel or a single analyte — every result ships with the raw data behind it.
Peptide Purity (HPLC)
RP-HPLC area normalization at 214 nm. Reported as the target peptide against all peptide-related peaks, with the chromatogram printed in full.
Spec: ≥ 95.0%Identity (HPLC-RTM)
Retention time comparison against a reference standard confirms the compound is what the label says. This is what catches a substitution.
Confirmed vs. referenceNet Peptide Content
How many milligrams of peptide are actually in the vial, reported against labeled content so underfill surfaces here instead of in a customer's inbox.
Report only · mgFentanyl Screen
Immunoassay at a 50 ng/mL cutoff on every panel. Not an upsell and not optional — a contamination result nobody should have to ask for.
50 ng/mL cutoffHeavy Metals (ICP-MS)
Arsenic, cadmium, lead, mercury, and chromium screened per USP <233> methodology against internal limits for research-use materials.
5 elements · ppmSterility & Endotoxin
Sterility by PCR against a no-growth specification, plus endotoxin by USP <85> kinetic turbidimetric method, reported as a quantitative value.
PCR · USP <85>How it works
Vial in the mail, certificate in four days.
Four steps, and you only handle two of them.
Tell us what you're sending
Compound, label claim, and how many samples. We reply with a submission ID and the shipping address the same business day.
Ship the sample
One sealed vial per test, unopened, with the submission ID on the outside. Room-temperature shipping is fine for lyophilized material.
We run it and write it up
Chromatogram, impurity table, mass confirmation, and the numbers behind each figure — not a one-line pass or fail.
Your code goes live
The certificate hits your inbox and becomes searchable here immediately. Print the code on the label and customers verify it themselves.
The certificate
Written to survive a skeptical reader.
Buyers cross-check these. Every certificate is built to hold up when they do.
- Sample identifiers — search code, lot number, COA number, labeled content, sample matrix, and both the date received and the date analyzed.
- Analyte table — every test with its specification, result, unit, and status side by side, so a reader can check the result against the spec themselves.
- HPLC chromatogram — the trace at UV 214 nm, printed full width rather than cropped to the target peak.
- Notes & methodology — the method behind each figure, including what the purity calculation does and does not include.
- Lab director signature — signed and dated, with the ISO/IEC 17025 accreditation marks.
- QR code and search code — printed on page one, scannable straight to this page.
Pricing
Per sample. No retainer.
Volume rates open up once you're testing every batch.
One analyte, one sample. Good for spot-checking a new supplier.
- Purity, identity, or net peptide content
- Chromatogram and methodology notes
- Search code and QR on the certificate
Every analyte on one certificate. This is what buyers expect to see on a product page.
- Purity, identity, and net peptide content
- Fentanyl screen and heavy metals by ICP-MS
- Sterility by PCR and endotoxin by USP <85>
- Priority queue
Standing testing on every production batch, with your catalog grouped under your brand here.
- Volume rate per sample
- Recurring batch scheduling
- Branded verification page
Questions
Before you ship.
Who can submit samples?
Any business or individual working with research compounds. We test what arrives and report what we find — we don't sell, source, or endorse anything we analyze.
What if the result comes back poor?
We issue it anyway. The certificate reports what the sample was, and results aren't negotiable after the fact. That's the only reason a verification code is worth anything.
Can I keep a result private?
Yes. Certificates are private by default and only become searchable here when you ask us to publish them.
How do customers verify a code?
Every certificate carries a search code and a QR code on page one. Scanning the QR or typing the search code into the field at the top of this page opens the report. You can also link straight to it, which is what most sellers put on their product pages.
What does the purity number actually mean?
Peptide purity is determined by RP-HPLC area normalization at 214 nm, so it's the target peptide as a percentage of all peptide-related peaks. Non-peptide process-related impurities are excluded from that calculation — which is why net peptide content is reported separately rather than folded into the purity figure.
What exactly do you need shipped?
One sealed, unopened vial per test ordered, with your submission ID written on the outside of the package. Lyophilized material ships fine at room temperature.
Why Michigan?
Because we're here. Samples are received and analyzed in state rather than forwarded overseas, which is most of the reason turnaround is four days instead of four weeks.
Get started
Send one vial and see the report.
Tell us the compound and label claim. You'll have a submission ID and shipping address today.