Reverse-phase C18 at 220 nm against a qualified reference. Chromatogram published with every certificate. ≥98% required to list.

Observed monoisotopic mass matched to the expected sequence within ±0.5 Da. Identity confirmation, not inference from purity alone.

Kinetic chromogenic LAL on every peptide lot, reported in EU/mL against a ≤0.25 EU/mL specification.

• Orders before 2 PM ET ship same or next business day; median order-to-ship 48 business hours.
• First class $8.50 (3–5 d) · Priority $15.50 (2–3 d) · free priority over $150.
• Tamper-evident secondary packaging, plain discreet outer shipper, tracking on every order.
• US domestic at launch; no PO boxes, APO/FPO, forwarders or reshippers.

• One free reship per order for lost or failed/tampered shipments — photo + batch code, no argument.
• If a batch fails your own re-testing, send the result; we re-test the retained sample and reship or refund.
• Unopened returns within 30 days; opened vials are covered by the reship guarantee.
• Wholesale from 50 vials (−30%) and 100 vials (−50%, dedicated batch): wholesale@stratumbiologic.com