Reviews
The unedited wall
Moderated for spam only — the critical ones stay up. Verified purchase badges mean the reviewer’s email matches a real order.
- 4.6
- Average rating
- 74
- Published
- 78%
- Verified buyers
Mass-spec confirmed the fragment
Expected vs found mass on the COA matched our own ESI-MS read. Good to see acetate content reported too — most vendors hide the counterion. Clean documentation.
COA matched to the decimal
Being able to look up the certificate by lot number before ordering is the whole reason we switched. Documentation is impeccable.
COA matched to the decimal
Lyophilized cake dissolved fully in bacteriostatic water with no cloudiness or residue. Net peptide content on the COA let me hit exact working concentrations.
Good — wish the vial had more headspace
Purity and identity were on point. Only nitpick is the vial is a touch small for larger diluent volumes — minor.
Great product, shipping a day slow
Purity and identity were on point. Only nitpick is the vial is a touch small for larger diluent volumes — minor.
Reordering for the next cohort
Packaging was discreet and protective, labels crisp, and the lot resolved to a real report in the COA vault. Zero complaints.
COA matched to the decimal
Ordered the 5-vial bundle — per-vial pricing is fair and the volume discount applied exactly as shown. Smooth checkout.
Exactly what a supplier should be
Dispatched same day, arrived sealed with legible lot numbers. The batch report was already in the vault before the package landed.
Good purity, cold pack intact
Arrived with the gel pack still cold and vials undamaged. HPLC purity as stated. Handling instructions on the insert were clear about −20 °C storage.
Reliable, small label gripe
No issues with the material itself. The label print was slightly faint on one vial but still fully legible.
No cloudiness, no residue
Being able to look up the certificate by lot number before ordering is the whole reason we switched. Documentation is impeccable.
Sealed, labeled, traceable
Ran our own analytical HPLC on the lot and it agreed with the published COA within tolerance. Identity confirmed by MS. This is what a research supplier should be.
Fast, sealed, documented
Dispatched same day, arrived sealed with legible lot numbers. The batch report was already in the vault before the package landed.
Reliable, small label gripe
No issues with the material itself. The label print was slightly faint on one vial but still fully legible.
Batch data lines up
Packaging was discreet and protective, labels crisp, and the lot resolved to a real report in the COA vault. Zero complaints.
Purity confirmed in-house
Lyophilized cake dissolved fully in bacteriostatic water with no cloudiness or residue. Net peptide content on the COA let me hit exact working concentrations.
Sealed, labeled, traceable
Being able to look up the certificate by lot number before ordering is the whole reason we switched. Documentation is impeccable.
Reordering for the next cohort
Ran our own analytical HPLC on the lot and it agreed with the published COA within tolerance. Identity confirmed by MS. This is what a research supplier should be.
Reliable for repeat study designs
We qualify every batch and PepBiotech's COAs make that painless. Lot lookup on the site is exactly what our QA needs for traceability.
The transparency I was looking for
Lyophilized cake dissolved fully in bacteriostatic water with no cloudiness or residue. Net peptide content on the COA let me hit exact working concentrations.
Good — wish the vial had more headspace
No issues with the material itself. The label print was slightly faint on one vial but still fully legible.
Lab-grade and verifiable
Ran our own analytical HPLC on the lot and it agreed with the published COA within tolerance. Identity confirmed by MS. This is what a research supplier should be.
The transparency I was looking for
Being able to look up the certificate by lot number before ordering is the whole reason we switched. Documentation is impeccable.
Great product, shipping a day slow
Everything checked out against the COA. Shipping took a day longer than expected but arrived well packed.
Longer stories
Why people switch to verified
“I qualify incoming reference materials for a shared research facility, which means I re-test what vendors send. PepBiotech's COAs consistently match my own HPLC and mass-spec reads. That reproducibility is the entire point of a research supplier, and most don't clear the bar.”
Dr. Sarah OkaforAnalytical chemist · academic core facility“For complex analogs like the incretin peptides, the fatty-acid side chain is where cheap material fails. Their mass-spec data accounts for it against the theoretical mass. I can hand a student a vial and a COA and trust the experiment starts from a known quantity.”
David Chen, PhDPrincipal investigator · metabolic signaling“Traceability is non-negotiable for us — every material has to map to a lot and a certificate. The lot-number lookup and per-batch COA library make our QA audits painless. It's the transparency standard the research-peptide space badly needed.”
Dr. Amelia RostovaLab manager · contract research