A laboratory freezer is not a shelf. Lyophilised research materials held at −20°C or below, sealed with desiccant and protected from moisture, heat and light, sit inside a documented chain that begins with synthesis, passes through independent testing and UK verification, and ends at dispatch. When that chain is interrupted — a planned unit replacement, a temperature excursion, a stock reconciliation after relocation, or a routine internal audit — the contents stop being ordinary stock and become material awaiting re-release. That is the point at which a supplier may decline to sell a fixed peptide blend. Rebuilding freezer inventory is a sequence rather than a restock. Vials are counted and…