Research-grade peptides.
Built on transparency.
Zeptix Labs is a U.S.-based supplier of research-grade peptides for qualified laboratory use. We built Zeptix around a simple idea: researchers should be able to verify every claim we make — testing, purity, and documentation — before a vial ever ships.
What sets us apart
Independent third-party testing
Every lot is analyzed by independent, U.S.-accredited laboratories using HPLC to confirm identity and purity. We never rely on in-house numbers alone.
Public Certificates of Analysis
Certificates of Analysis are published in our COA library with purity percentage, analytical method, and testing laboratory. You can review documentation before you buy. Browse the COA library →
99%+ purity standard
Every compound must meet a 99% minimum purity threshold, verified by HPLC, before it is listed in our catalog.
Same-day U.S. shipping
Orders placed before 6 PM EST ship the same business day from our U.S. facility, with 2-day expedited delivery and free shipping on orders over $200.
Responsive research support
Our support team answers product, documentation, and order questions within 24 hours — so your research is never waiting on us.
