TESTING STANDARDS

Every batch is tested before release

Each production run is analysed before it is listed. The certificate for that run is published in the COA Library and linked from the product page.

If a batch has no published report in the library, it is not sold.

The laboratory is independent

Analysis is carried out by Ozcanium Analytics, a laboratory independent of Dr Pepr. The result does not rely on our own measurement, and the report code on each certificate can be checked directly with the laboratory.

What is measured

Two methods are used. High performance liquid chromatography separates the components of the sample and measures the relative amount of each, which produces the purity figure. Liquid chromatography with tandem mass spectrometry measures molecular weight, which is used to confirm identity.

Net content is also reported, so the certificate states the peptide mass rather than only the total mass of the lyophilised solid.

What the purity figure describes

Purity is the proportion of total detected peak area attributed to the target compound. It describes relative composition within what the method detects. It is not a statement of absolute mass, and it is specific to the batch tested.

Results apply to one batch only

Every vial label carries a batch number, and that number identifies the single production and testing run the vial came from. A certificate from a different batch does not describe it. This is why certificates are published per batch rather than per product.

Storage and handling

Peptides are supplied lyophilised in sealed vials. Storage conditions for each compound are listed in the specifications on its product page and on the certificate.