The custody block above records the shipping conditions this vial actually experienced, which is the condition an ordinary buyer's vial experiences too. That representativeness is the point.
shipping_temp
Cold-chain failures and their analytical signature. Runs a data logger in every box.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
2
n=2
Annotations
178
n=178
Median purity submitted
suppressed
n=2
n<3 — see individual records
Suppliers covered
2
n=2
Section 2
Records submitted
A submitter chose to buy this material and to pay for this assay. That choice is the selection mechanism behind the whole index and it is not random.
| Report | Compound | Supplier | Lot | Lab | Quarter | Purity % | Water % | Recovery % | Provenance | Flags | Result |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AX-2026-041870 | Retatrutide | SinoPep | SNP-2603-G4042 | Janoshik | 2026-Q1 | 97.29 | 5.12 | — | Buyer-sourced | 1 | MARGINAL |
| AX-2024-004957 | PT-141 (Bremelanotide) | MKM | MKM-2406-H3711 | Nordanalyt | 2024-Q3 | 98.64 | 5.56 | — | Buyer-sourced | 0 | PASS |
Section 3
Annotations
Signed technical comments on records. The index does not moderate annotations for agreement with its own arithmetic, and several of these disagree with it. Where a handle has made the same point on several records, one instance is shown and the rest are reachable from the records themselves.
A data logger in the box would upgrade this record further. Custody is documented; temperature history is inferred, and inference is weaker than measurement.
Direct despatch to the laboratory shortens the custody chain, which genuinely improves the material's condition on arrival. Some of the provenance effect is that rather than selection.
Reduction in transit needs a reducing environment, which is unusual in a dry cake and common in a reconstituted solution. Where the material was shipped reconstituted, that is the first hypothesis.
Sulfoxide at this level with no cold pack recorded in the custody chain is a coherent story. Whether the lot left the plant this way is unanswerable from one record; a second vial from the same lot, shipped cold, would answer it.
Ambient shipping in summer across two climate zones is a different exposure from ambient shipping in February. The custody block gives days but not degrees, and degrees are what matter.
A custody chain without a cold pack on an oxidation-prone compound produces a genuine drop between release and assay. The custody block above is the first place to look.
Showing 7 distinct comments of 178 annotations by this handle.