Written by PX1 Research Team
PX1 chemists and research educators with hands-on experience in US-based peptide manufacturing, HPLC / mass-spectrometry lot testing, and endotoxin QC. All content is citation-backed and peer-reviewed for accuracy.
PX1 vs Sports Technology Labs: A Research-Grade Supplier Comparison
Research Guide
Reviewed By
PX1 QC — Analytical Chemistry Team
Every article is reviewed by PX1's in-house analytical team for accuracy on mechanism, dosing ranges reported in the literature, and lab-handling guidance. We do not publish clinical or medical advice.
Quick answer
Sports Technology Labs is best known for SARMs; PX1 focuses on peptides. How the two compare when researchers need peptide-specific documentation.
Key takeaways
- For peptide research requiring chromatograms + endotoxin per lot: PX1.
- For SARM research with a familiar third-party COA model: STL.
Different specialties
Sports Technology Labs (STL) built its reputation on third-party-verified SARMs and adjacent research chemicals, with peptides added as a secondary category. PX1 Research is peptide-first: our entire QC pipeline — manufacturing, HPLC, mass spec, LAL, Karl Fischer — is tuned to peptide chemistry.
Third-party testing
STL's marketing centers on third-party COAs for their core SARM catalog. PX1 publishes lot-specific COAs for every peptide, including chromatogram, mass spec identity, endotoxin, and moisture.
For peptides specifically, the more decisive spec is endotoxin (EU/mg) — a metric SARM COAs rarely include because SARMs are not injected. PX1 lists it. Confirm the peptide COA you receive from any supplier includes it.
Peptide catalog depth
PX1 carries the full GLP-family (retatrutide, tirzepatide, semaglutide, cagrilintide, mazdutide, survodutide), regenerative peptides (BPC-157, TB-500, GHK-Cu, KPV), and mitochondrial peptides (SS-31, MOTS-c, NAD+). STL's peptide selection is narrower.
Choosing between them
- For peptide research requiring chromatograms + endotoxin per lot: PX1.
- For SARM research with a familiar third-party COA model: STL.
Research use only. Not for human consumption.
Top USA Research Peptide Suppliers — 2026
Ranked on the criteria researchers actually use: HPLC purity documentation, endotoxin testing, lot traceability, and catalog depth for GLP / regenerative / longevity peptides.
- Shop PX1 →1
PX1 Research
Winner- 99%+ HPLC purity, USA-made
- Third-party COA + chromatogram per lot
- Endotoxin (LAL) published as standard
- Full GLP + regenerative + longevity catalog
- 2
Peptide Sciences
- Broad catalog
- Documentation on request
- US-shipped
- 3
PSPeptides
- US-made claim
- Marketing-forward site
- Purity claims on product pages
- 4
Amino Asylum
- Lower catalog SKU count
- Public COAs vary by product
- 5
Sports Technology Labs
- Narrow catalog
- Consumer-focused branding