Quality & testing
Tested twice.
Verified in your hands.
Most suppliers forward whatever certificate their source hands them—if any. RetaGrade does the opposite: every batch is tested by the manufacturer and re-tested by an independent lab, then tied to a certificate you can verify yourself from the label.
The RetaGrade difference
Two independent checks per batch
1 · Manufacturer testing
The source lab tests the material and issues a certificate of analysis with the batch.
2 · RetaGrade independent testing
We re-test at a lab with no stake in the sale. A batch ships only if both agree.
Why a second test matters
A certificate is only as good as the lab that wrote it.
A manufacturer's COA is a useful starting point—but the manufacturer also has an interest in the batch passing. An independent re-test removes that conflict. When two labs with no shared incentive reach the same result, the number means something.
Step 1
Received & quarantined
Each inbound batch is logged, assigned a lot number, and held—nothing ships before it clears testing.
Step 2
Independent third-party testing
A representative sample is sent to an accredited lab that has no stake in the sale.
Step 3
Reviewed against spec
Qualified analysts compare every result to acceptance criteria before a batch is cleared.
Step 4
COA published
The certificate is tied to the lot and made verifiable by the QR code on your label.
Step 5
Cold-chain fulfillment
Cleared vials are cold-stored and shipped in insulated, temperature-controlled packaging.
What every batch is screened for
The full analyte panel
Purity is table stakes. The tests that protect a research workflow are the contaminant screens many suppliers leave off the certificate.
Peptide purity
RP-HPLC (area normalization, 214 nm)
Confirms the target peptide is not diluted by related impurities.
Identity
HPLC / LC-MS retention-time & mass
Verifies the vial contains the compound on the label.
Fentanyl screen
Immunoassay (50 ng/mL cutoff)
Screens for one of the most dangerous cross-contaminants.
Heavy metals
ICP-MS (As, Cd, Cr, Hg, Pb)
Detects elemental impurities that can carry over from synthesis.
Endotoxin
USP <85> kinetic turbidimetric
Quantifies bacterial endotoxin against reference thresholds.
Sterility
PCR
Checks for microbial growth in the finished material.
RetaGrade vs. a typical provider
Where we don't cut the corner.
"Typical provider" describes common practice across the research-supply market, not any specific company.
Why work with RetaGrade
Proof you can hold, not promises.
Verifiable by you
Scan the QR on the label and read the certificate for your exact lot.
Two independent checks
The manufacturer tests it, then we re-test it at an independent lab.
Full-panel testing
We screen for heavy metals, endotoxin, sterility, and fentanyl.
Cold-chain integrity
Cleared material is cold-stored and shipped in insulated, temperature-controlled packaging.
Batch traceability
Every vial ties back to a lot number, its test methods, and the results behind it.
Research-use transparency
Claims are attributed to sources and methods—presented as evidence to inspect, not marketing.
See it for yourself
Start with a batch you can verify.
Materials are supplied for laboratory research use only—not for human consumption, and nothing here is medical advice. Testing and handling claims can be confirmed from the certificate on your label.