Testing Documentation
Review reported testing methods
US-based research peptide supplier
Buy Peptides,Research with Confidence.Shipped from the US.
Pax Peptide supplies US researchers with research peptides and clear product specifications. Where available, batch-specific Certificates of Analysis can be viewed and downloaded on the product page, including reported testing methods and purity. Orders placed before 2pm ET are eligible for same-day handling from the US after review and payment settlement.
For laboratory research use only
Batch-Specific Purity
See results in available COAs
Same-Day Handling
Eligible orders before 2pm ET
COA Documents
View and download where available
Summer sale
Summer sale! 20% off all products for a limited time.
The research collection / 01
Small vials. Expansive possibilities.
Explore the current catalog, compare specifications, and find the materials for your next line of inquiry.
Metabolic Research
20% offRetatrutide
10mg vial
$80$64
Per vial
Metabolic Research
20% offTirzepatide
10mg vial
$58$46
Per vial
Tissue Studies
20% offGHK-CU
100mg vial
$49$39
Per vial
Cellular Research
20% offMOTS-C
20mg vial
$109$87
Per vial
Cellular Research
20% offNAD+
500mg
$65$52
Per vial
Lab Support
20% offBAC WATER
10ml vial
$10$8
Per vial
Research by material
Know the molecule.
Explore the science.
Discover what published studies report about the materials in our catalog, from molecular mechanisms to evidence gaps.
Metabolic Research / 5 min read
Retatrutide Research: Triple-Receptor Signaling and Metabolic Studies
A research profile of retatrutide (LY3437943), connecting receptor experiments and mouse studies to selected phase 2 human trial findings and their limits.
Read the researchTissue Studies / 5 min read
BPC-157 Research: Tendon Cells, Vascular Signaling, and Evidence Limits
A study-specific look at BPC-157 experiments on fibroblast migration, growth-hormone receptor expression, and vascular signaling, with the human evidence kept separate.
Read the researchCellular Research / 5 min read
MOTS-c Research: Mitochondrial Signaling and the Human Evidence Boundary
Explore original MOTS-c studies spanning metabolic signaling, nuclear localization, mouse exercise endpoints, and human measurements of the endogenous peptide.
Read the researchThe Pax standard / 02
Clarity is part
of the process.
From the first specification to the final shipment, the details should be easy to find. Our approach keeps product information, documentation, and fulfillment connected.
Explore our standardsDefined specifications.
Review vial sizes, storage guidance, and live availability before your materials reach the lab.
Connected documentation.
Explore available certificates of analysis linked to the products and batches they support.
Visible fulfillment.
Follow your order from review to shipment, with clear updates at every step.
A direct line to Pax / 03
Your next question starts here.
Product questions, documentation, or custom orders. Let’s talk research.
For laboratory research only
All PaxPeptide products are sold strictly for laboratory research use. No listing, cart action, checkout step, or policy page implies human consumption, therapeutic use, diagnostic use, veterinary use, cosmetic use, or personal application.