Batch (lot) numbers: how they are built and how to verify one

Written 23 September 2026, last changed 27 October 2026 by the trade desk. About 5 minutes to read.

To verify a batch number, type the number printed on the box label into the certificate page, or scan the QR code on the box: it is looked up in the register its certificate was issued from. The number on the box must read identically on the certificate; if it does not, something has been mixed up.

How ours are built

The form, the month of manufacture, the product code, and the batch sequence. L2607-RT30-0002 reads as lyophilised, made July 2026, product RT30, second batch of that line. Nothing in it is random, so a number can be sanity-checked by eye: a batch of RT30 dated in the future, or a code that is not on the price list, is wrong before anyone looks it up.

What travels with an order

The packing list shows the batch against every line. The certificate of analysis for each batch is sent with the shipment, and again on request. Retained samples of every batch are held for twelve months from the batch's last dispatch, against any query.

Verifying a number

Type any batch number into the certificate page and the number is looked up in the register the certificate was issued from, so a certificate edited after issue will not match what comes back.

Reading one at goods-in

Three checks take a minute a carton. First, every vial in a box is from the same batch, because a box is filled and sealed from one batch. Second, the batch number on the box, printed or behind its QR code, matches the line on the packing list. Third, the product code inside the number matches the code on the label: a vial labelled TR30 with a batch number carrying RT30 has the wrong label or the wrong batch, and either way it stops there. Write the batch number into your own stock record against the order, so that a query a year later can be traced from your side as well as ours.

One batch, several orders

A batch is usually larger than an order, so the same batch number will appear on shipments to several accounts over weeks. That is normal and is what makes a recall possible: if a batch is ever withdrawn, every account that received it is told, by batch number. Two orders to the same account from the same batch will carry the same number, and two orders a month apart usually will not, because the oldest in-date batch is picked first.

When the number does not match

Report it within five business days of delivery with photographs of the carton and the vials, and do not use the batch. A mismatch is treated as a shortage or a wrong shipment and is put right at our cost.

When a vial carries no batch number

Without a batch number on the box, a certificate describes some batch, not necessarily this one. There is no retained sample to pull and no recall that could reach the vial. Because vials leave their boxes, write the batch number into your own stock record when a box is opened.

If stock arrives with no batch number on the box, printed or as a QR code, do not book it in as certified. Ask the supplier for the number and the certificate that carries it. If neither comes, enter the stock in your register as uncertified, keep it apart, and treat any result obtained on it as standing alone.

Every box we ship carries its batch number, printed on the label or in a QR code that opens its certificate. One from us without either is a labelling error and is treated as a wrong shipment under the rule above.

Applies to

This guide was written with Retatrutide in mind, and it holds for the other lines of its kind; the full list is on the compounds page.

Questions about verifying a batch

How do I verify a peptide batch number?

Take the number off the vial rather than off the paperwork, and look it up at the certificate page, which shows the record that batch’s certificate was issued from. A number that resolves, and resolves to the product and strength printed on the vial in your hand, is the check worth running. A number that only exists in a PDF someone emailed you is not.

How can you tell a certificate of analysis is real?

By whether it can be checked against a record. Anyone can edit a PDF, so the document itself proves very little; what is hard to fake is a batch number that matches the box and the register its certificate was issued from, and a retained sample that can be pulled and retested on request. Retained samples are held here for twelve months from dispatch, which means a question about a batch can be answered against the material rather than against the file.

What if the batch number on the box does not match the certificate?

Stop and report it to the desk within five business days with both numbers and a photograph of the label. It is handled as a wrong shipment at our cost, as the claims, refunds and returns page sets out. Do not use material whose paperwork does not describe it, and do not accept a replacement certificate that was written rather than issued.

Can my own customers look up a batch number?

Yes. Any batch number we ship can be looked up on the certificate page, by your customers as much as by you: the number on the box, printed or behind its QR code, is looked up in the register its certificate was issued from. The certificate carries its issuer’s name and the batch number, never your brand, so what you hand your customer is the batch number. Selling under a brand of your own is set out in the guide to white label and private label. Every batch has a certificate of analysis, sent with the shipment, and again on request.

Why do two orders share the same batch number?

Because a certificate belongs to the batch, not to the order. Two orders drawn from the same fill carry one number and one certificate, and an order with three lines from three fills carries three. Keep each certificate with the stock it describes so a query a year later can be answered from your own shelf.