What a lot number is, and why it must match the vial

Updated October 21, 2026

A lot number, also called a batch number, identifies one production run of a product. A lab report tests a sample from one lot and names it. The report only tells you about vials with that same number, so the first check on any COA is that its lot number matches the one printed on your vial.

For research use only. This guide explains laboratory documents. It is not medical advice and says nothing about using any compound.

Where to find the lot number

It is printed on the vial label, often next to LOT, and sometimes also on the box or cap. On Torrey Labs vials it is on the label, and the batch number lookup opens the report for it.

How to look up a batch number

Type the lot number exactly as printed into the seller's lookup. If the seller has no lookup, ask for the report for that lot by number. A report that comes back with a different lot number is about a different batch.

Why one report can't cover every lot

Each production run is made separately, so purity and content can differ between runs. A report from an earlier batch, or one attached to several strengths, describes a sample you don't have. Each lot, and each strength, should have a report that names it.

Common questions

Is a lot number the same as a batch number?

Yes. Both name one production run. Labels and reports use the two terms interchangeably.

What if the lot number on the report doesn't match my vial?

Then the report describes a different batch. Ask the seller for the report for your lot number.