≥99.1%
Featured
Repair & Regenerative
BPC-157
A 15-amino-acid synthetic peptide derived from a sequence found in gastric juice, widely used as a reference standard in tissue-model research.
Research-grade peptides
Every batch verified before it earns a label.
PEPTiQX releases nothing without an independent certificate of analysis — purity by HPLC-UV, identity by LC-MS, net content confirmed. Search any batch number and read the exact certificate that shipped with your vial.
Third-party tested
ISO/IEC 17025 labs
Same-day dispatch
≥98%
Release specification
99.1%
Average measured purity
3
Independent laboratories
7X
Tested
Catalog
Featured research peptides
Lyophilised, batch-tested and shipped with the certificate that belongs to your lot.
≥99%
Featured
Repair & Regenerative
TB-500
A synthetic fragment of the thymosin beta-4 protein, used as an actin-binding reference peptide in cytoskeletal research.
≥99.4%
Featured
Cosmetic & Dermal
GHK-Cu
A copper-complexed tripeptide used extensively as a reference standard in dermal fibroblast and collagen research.
≥99.3%
Featured
Metabolic Research
Ipamorelin
A pentapeptide used as a reference standard in growth hormone secretagogue receptor binding research.
Why PEPTiQX
Verification you can check yourself
Trust in this category should be auditable, not asserted. Every claim we make is backed by a document you can open.
Batch-level certificates
Not a representative COA from a lot made two years ago — the certificate for the batch number on your vial.
Independent laboratories
Purity and identity are measured by accredited third-party labs. We never self-report an assay result.
Out-of-spec is destroyed
Batches below 98% are quarantined and destroyed. We do not blend, re-test to pass, or quietly downgrade.
Full analytical panel
HPLC-UV purity, LC-MS identity and gravimetric net content on every released lot.
Same-day dispatch
Orders before 3 PM AZ leave the same business day, in insulated packaging appropriate to the sequence.
Researchers on support
Questions about handling and reconstitution are answered by people who have done it.
Verification
Recently released batches
Each of these certificates was issued by an independent laboratory before the lot was cleared for sale.
KPV
Batch PQX26071133
99.55%
✓HPLC-UV purity
✓LC-MS identity
✓Freedom Diagnostics
Tested Jul 26, 2026
Open →
Semax
Batch PQX26071063
99.43%
✓HPLC-UV purity
✓LC-MS identity
✓Janoshik Analytical
Tested Jul 25, 2026
Open →
Selank
Batch PQX26071077
98.56%
✓HPLC-UV purity
✓LC-MS identity
✓Colmaric Analyticals
Tested Jul 24, 2026
Open →
BPC-157
Batch PQX26071007
98.79%
✓HPLC-UV purity
✓LC-MS identity
✓Freedom Diagnostics
Tested Jul 20, 2026
Open →
Our standard
A release specification we do not negotiate with
Purity below 98.0% does not ship. Identity that does not confirm against the calculated monoisotopic mass does not ship. The commercial cost of destroying a failing batch is the entire point of having a specification.
✓Reverse-phase HPLC-UV purity at 214 nm
✓LC-MS identity against calculated monoisotopic mass
✓Gravimetric net content against label claim
✓Certificate keyed to the batch number on your vial
Browse
Research areas
Organised by the research context these materials are used in.
Metabolic Research
Metabolic and endocrine research peptides
Browse →Repair & Regenerative
Tissue, collagen and matrix research
Browse →Cognitive & Neuro
Neuropeptide research standards
Browse →Cosmetic & Dermal
Dermal and cosmetic science research
Browse →Lab Supplies
Solvents, diluents and consumables
Browse →
How it works
From order to bench
Place your order
Certify research use at checkout and pay through our secure processor. We never see your card details.
We pull your lot
Your vial is picked from a specific batch, and that batch's certificate of analysis is attached to your order.
Same-day dispatch
Orders before 3 PM AZ ship the same business day in insulated packaging.
Verify on arrival
Match the batch number on the label against the COA library before you open anything.
Research notes
Written for people who pipette
Analytical method explainers and handling guidance from our lab team.
Analytical
How to actually read a certificate of analysis
A COA is only useful if you know which numbers matter. Here is what each section on a peptide certificate is telling you — and the three things people most often misread.
◷ Infographic
Aug 05, 2026
6 min read
Analytical
HPLC-UV and LC-MS answer different questions
Purity and identity are not the same property, and the two methods that measure them are not substitutes for one another.
▤ Infographic
Jul 27, 2026
5 min read
Handling
Reconstitution practices that preserve your sequence
Shearing, oxidation and adsorptive loss all happen at the bench, after the material leaves our hands. A few habits prevent most of it.
◷ Infographic
Jul 18, 2026
4 min read
From the field
What researchers tell us
The batch-searchable COA library is the reason we switched. Matching a certificate to a lot number should be table stakes and almost nowhere does it.
Dr. A. Reyes
Principal Investigator, cell biology
Purity numbers move between lots and PEPTiQX publishes that rather than hiding it behind one flattering certificate. That candour is worth more than a decimal place.
M. Okafor
Lab Manager, analytical chemistry
Support answered a reconstitution question about a Met-containing sequence with actual chemistry instead of a canned reply.
Dr. S. Lindqvist
Research Scientist
Questions
Common questions
How is purity measured?
Purity is determined by reverse-phase HPLC with UV detection, typically at 214 nm where the peptide bond absorbs. The reported figure is the target peak area as a percentage of total integrated peak area. Our release specification is ≥98.0%.
How do you confirm identity?
Identity is confirmed by LC-MS. The measured mass is compared against the expected monoisotopic mass calculated from the sequence. A batch that does not match is not released, regardless of its purity number.
Who performs the testing?
Testing is performed by independent ISO/IEC 17025 accredited laboratories — we do not self-report purity. The laboratory that tested your specific batch is named on the certificate of analysis.
Can I get the COA for the exact vial I received?
Yes. The batch number is printed on your vial label. Enter it in the COA library and you will get the certificate for that specific lot, not a representative sample.
What happens if a batch fails specification?
It is not released for sale. Out-of-specification material is quarantined and destroyed. We do not blend, re-test until pass, or downgrade failing lots.
New batch releases, as they post
A short email when new lots clear testing and their certificates go live.
New batch releases and COA postings. Unsubscribe anytime.
