Independent Third-Party Testing
Every batch is tested by an independent CLIA-certified laboratory — not our own in-house lab. We use HPLC with UV detection coupled with Mass Spectrometry. Our Certificates of Analysis include the testing lab principal chemist's signature and the exact methodology used.
USA-Manufactured
All peptides are synthesized in USA-registered facilities following Good Manufacturing Practices. We do not source from overseas manufacturers. Full chain of custody documentation is maintained and available on request.
COA + Endotoxin on Every Batch
Certificate of Analysis and endotoxin report on every single batch — not just spot checks. Click any product to download the current COA PDF. No stock images — product photos show actual vials.
American Peptide Association Member
Hotspan Labs is a proud member of the American Peptide Association. Our membership reflects ongoing commitment to industry compliance, transparency, and research-grade standards across everything we produce.
Purity Standard: ≥99%
We guarantee ≥99% purity on all peptides. Research applications typically require 95–99%+ purity for reliable results — lower purity introduces variables that interfere with in vitro studies and compromise data integrity. Our 99%+ standard meets pharmaceutical-grade requirements.
Storage & Reconstitution
| Condition | Guidance |
|---|---|
| Lyophilized storage | Store at -20°C for 12–24 months. Stable at 2–8°C for shorter periods. |
| Reconstituted storage | Stable several days at 2–8°C. Freeze aliquots at -20°C or -80°C for longer use. Avoid repeated freeze-thaw cycles. |
| Reconstitution | Use sterile bacteriostatic water (BAC water) and aseptic technique for multi-use applications. |
| Shipping | Lyophilized peptides ship at ambient temperature in protective packaging. Free standard domestic shipping over $250. |