Third-party HPLC + mass spec on every batch. Cold pack sized to your ZIP. Reply-to support.
Handling and transit
Freeze-drying removes water from the peptide, which is what would otherwise drive degradation in transit. A lyophilized vial, sealed correctly, is shelf-stable at ambient for the carrier transit window. The chain that matters happens at the lab and at your bench — not in a styrofoam box.
A liquid peptide degrades when warm because water + heat is the reaction the molecule loses to. Freeze-drying pulls the water out under vacuum and leaves a fluffy white cake in a sealed vial. Heat alone does much less to a dry cake than to a solution — that's why most research-grade peptides are sold lyophilized and most reputable suppliers don't ship cold. Ours: lyophilized, sealed, dry.
Vial integrity check, lot ID match, COA cross-reference, dry handling, foil-lined sealed mailer. Same-business-day dispatch on a tracked carrier — no overnight sitting in a warm warehouse. If a heat-wave window or a carrier outage lines up, we hold the order rather than risk it; you see the hold note on your account page.
Rehydrating with bacteriostatic water restarts the clock. The reconstituted solution is no longer ambient-stable — refrigerate at 2–8°C from that point forward and use within the manufacturer's stated window. Each batch ships with a storage card noting the recommended refrigerated shelf life so the timer doesn't drift. The Founders' Kit (free with first monthly subscription) includes a bench thermometer for the cold side.
Open immediately, but with dry hands. Vial seal intact, no condensation in the mailer, label dry, cake intact (lyophilized peptides should look like a small fluffy white disc — sometimes shrunken to one side; that's a freeze-drying cosmetic, not a problem). If anything looks wrong — seal cracked, label water-damaged, cake liquefied — photograph it, do not reconstitute, and reply to your order email. We replace or refund.
There's a small set of biologics that do require cold transit: certain reconstituted reference standards, water-based formulations, and a handful of unstable analogues. None of those are in our standard catalog right now. If we ever stock a SKU that needs it, the product page will say so explicitly and the pricing will reflect the real cost — not a stock-photo gel pack and a markup.
The chain that matters runs from the freeze-dryer at the lab to the moment you reconstitute at the bench. We do our part — clean lyophilization, dry handling, fast tracked dispatch. The storage card and the thermometer cover yours.
Common questions
Because lyophilized peptides don't need it for a tracked domestic transit window, and pretending otherwise would add cost, weight, and disposal burden without changing what arrives at your bench. Cold-pack shipping for a freeze-dried vial is mostly insurance theater. We'd rather put that cost into faster carriers, real third-party COAs, and reply-to support.
Unreconstituted (lyophilized): refrigerator (2–8°C) is best, but the dry cake tolerates room ambient short-term — check the per-batch storage card for the manufacturer's window. Reconstituted: refrigerate immediately and follow the recommended use-by date on the storage card. The bench thermometer in the Founders' Kit helps you log where your fridge actually sits.
Don't reconstitute. Photograph the mailer interior, the vial, and the seal, then reply to your order confirmation email with your order ID. We dispatch a replacement on the next ship day at no charge — no claim form, no insurance run-around. The replaced order ships with a fresh COA tied to the new batch.