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
- 2340
- Published
- 86%
- Verified buyers
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.
Great product, shipping a day slow
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.
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
Being able to look up the certificate by lot number before ordering is the whole reason we switched. Documentation is impeccable.
Reliable, small label gripe
Everything checked out against the COA. Shipping took a day longer than expected but arrived well packed.
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.
COA matched to the decimal
Packaging was discreet and protective, labels crisp, and the lot resolved to a real report in the COA vault. Zero complaints.
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.
Sealed, labeled, traceable
Packaging was discreet and protective, labels crisp, and the lot resolved to a real report in the COA vault. Zero complaints.
Lab-grade and verifiable
Packaging was discreet and protective, labels crisp, and the lot resolved to a real report in the COA vault. Zero complaints.
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
Being able to look up the certificate by lot number before ordering is the whole reason we switched. Documentation is impeccable.
Good — wish the vial had more headspace
Everything checked out against the COA. Shipping took a day longer than expected but arrived well packed.
Great product, shipping a day slow
No issues with the material itself. The label print was slightly faint on one vial but still fully legible.
Consistent lot to lot
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
Ordered the 5-vial bundle — per-vial pricing is fair and the volume discount applied exactly as shown. Smooth checkout.
Reordering for the next cohort
Ordered the 5-vial bundle — per-vial pricing is fair and the volume discount applied exactly as shown. Smooth checkout.
Fast, sealed, documented
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
Packaging was discreet and protective, labels crisp, and the lot resolved to a real report in the COA vault. Zero complaints.
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.
Decent, slower than hoped
COA matched and reconstitution was clean; transit was slower than the estimate this time around.
COA matched to the decimal
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.
Great value, clean COA
Fair price and a complete certificate. Dissolved instantly. Exactly what I need for repeatable cell work.
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