A lot is one batch
A lot is a batch of material made and handled together. Testing is done per lot, so a certificate of analysis describes one lot only. The lot number is what connects the material you received to the report about it.
Where to find it
Suppliers put the lot number on the vial label, the box or the order. At Method Biolabs it is on your order: your order email and the order in your account list it with each item.
When you look up a certificate, use the lot number for the material you received, not one shown as an example somewhere else, so you are checking the exact batch in your hands.
How to look one up at Method Biolabs
- Type the lot number from your order into the search at the top of any page, or into the lot lookup on the Certificates page.
- A lot number takes you straight to that lot’s page.
- The lot page shows the compound, the lot’s status, the test dates, the laboratory, the purity and identity results and the full certificate.
No account, email or request form is needed. Each lot’s page goes up as soon as its results are in.
What a lot’s status means
- Released. The lot was tested, met its specification and its certificate is published.
- Held. The lot is on quality hold, and nothing from it is sold while its page does not show Released. The page stays public so the hold is visible.
- Superseded. The record was replaced by a newer lot page, which it names. The old page is kept for the record.
The batch ledger
Every lot Method Biolabs publishes is recorded on a public batch ledger, with its test date, laboratory, status and certificate. Each entry carries a fingerprint of the entry before it, so changing an earlier entry would break the chain where anyone can see it. Updates to a lot are added as new entries, not written over old ones.
This guide explains how to check documentation. It is not advice on using any product. Method Biolabs supplies reference materials for laboratory research only: not for human or veterinary use, and no dosing or protocol guidance.
