Testing and quality
What a certificate of analysis on this shop shows, which laboratory issues it, and what each product page says while no certificate is published.
Updated 26 October 2026
The rule
A product page shows a purity figure only when a certificate of analysis (COA) for the batch on sale has been published, from a named laboratory. The certificate appears on the product page as a table, with the laboratory, the batch number, the test date, the method and the result, and the PDF beside it.
Where things stand
No certificates have been published yet. Every product page says so in its certificates section, and makes no purity claim. When a batch is tested, its certificate is added to the page for that size, and the batch it covers is stated.
What a certificate should show
- The laboratory, by name, with a way to check it exists.
- The batch number, matching the batch being shipped.
- The test date.
- The method: usually high-performance liquid chromatography (HPLC) for purity, and mass spectrometry (MS) for identity.
- The result: the measured purity as a percentage, and the measured mass against the expected mass.
Read how to read a certificate of analysis for what each line means and what to check.
Storage figures
Storage figures on the product pages come from published supplier inserts, which are cited on each page. They describe the supplier's own material, and the certificate for a batch takes precedence when it gives different figures.