How every batch is tested

Every batch is analysed by reversed-phase high-performance liquid chromatography before it is released, read at the wavelength of the peptide bond. Purity is the main peak’s share of the total peak area, and a batch is released only when that figure is 98.0% or higher.

A certificate belongs to a batch, not to a product name. The lot number is on the top of each box, and the certificate for that number records the result for the vials in your hands, so two orders of the same line from different batches have two certificates.

1. Find the lot number on the top of the box.
2. Enter it at the lab’s certificate lookup, tjqxgdlab.com, or send it to us and we will send the certificate.
3. Check that the compound and the purity on the certificate match your order, and its lot number the one on the top of your box.

If anything does not match, write to us with the lot number from the top of the box and a photo of it before you use the material.

Peptides are supplied as lyophilised, freeze-dried, powder in sealed vials, ten to a box unless the line says otherwise. Lyophilised material keeps best unopened, frozen at −20 °C, dry and away from light. Solutions such as bacteriostatic water are listed with their volume per vial.

The shelf is drawn from live stock. A line appears only while it is in stock (28 today) or already on its way to us (21 today, due by 25 October), so every label you can order from describes material that exists.

All products are sold for laboratory research use only. We do not give dosing, administration or usage guidance. See the research use policy.