Lot numbers explained

Every shipment is tied to a specific lot. The lot number is the durable identifier that links your shipment to the COA.

Format

Internal lot numbers look like PS-{peptide}-{YYMMDD}-{n} — for example PS-RETA-260512-A. They appear in JetBrains Mono (our "data face") on the order detail page so they're easy to copy.

Why it matters

• The COA is keyed to the lot, not the SKU. Two orders of the same SKU might pull from different lots with different production dates.
• For incident investigation (broken seal, temperature excursion, COA discrepancy), we trace by lot.
• For regulator inquiries, the lot is the index — the chain-of-custody record lives under it.

How lots get assigned

On placement we lock the earliest-expiring lot with sufficient on-hand quantity. This minimizes waste and keeps the inventory turning. Manual overrides for special-case orders happen at the admin level.