The trace tells you everything
A data-logger records temperature every sixty seconds and stores the result on-board until someone reads it out. When a shipment arrives, the scientist scans a QR code that uploads the trace to a portal. Each one is a thirty-six to ninety-six hour line. The interesting parts are the spikes.
Across Q1 our median transit time was 2.4 days, with a P95 of 3.8 days. Inside the box, temperature rose above 8 °C in 14% of shipments — almost all of them briefly, at drop-off in tropical destinations. Only 0.3% exceeded 25 °C for longer than the 48-hour stability window we publish.
Why room-temperature isn’t “fine”
Many peptides are dry in the vial and tolerant of short thermal excursions. Many are not. Peptides with disulfide bridges — BPC-157 doesn’t have them, but many regenerative and hormone peptides do — are particularly sensitive to oxidation when reconstituted, and even dry vials can lose potency if held at elevated temperatures for days.
The common response — “it’ll be fine, just put it in the freezer when you get it” — relies on an assumption. The assumption is that nothing happened between the warehouse and your bench. We don’t assume.
The replacement rule
If the data-logger shows an excursion above 25 °C for more than 48 hours, we replace the lot. No claims process, no photos of the box. The logger trace is the evidence. This is one of the few places where the cost of doing the right thing is clearly justified by the alternative.