Methodology
Quality and methodology
What we check, what we publish, and what we refuse to claim.
What a figure has to carry
A specification figure appears on a listing with a recorded primary source and the date it was read, or it does not appear. There is no third option where a plausible value is entered and tidied up later.
8 of 8 listings state all four identity figures — CAS number, sequence, molecular formula and molecular mass. All 32 of those figures carry a source entry behind them. The product page prints the date next to the figure, and an em dash where there is no entry.
Two classes of source, and the page keeps them apart. A public chemical registry is named and linked, because you can open it and check the figure yourself. A manufacturer’s own specification sheet is dated and not linked, because linking it publishes our sourcing. That is a commercial decision and it costs you the ability to check those rows; the page says which rows they are rather than blurring the two together.
Assay
Where a batch is assayed, it is assayed by an independent laboratory. We do not run the analysis ourselves, because a purity figure produced by the party selling the material is not evidence — it is an assertion with a decimal point in it.
A certificate is published only when it carries all five of: a named laboratory, a batch identifier, a stated method, a test date, and a legible result. A certificate missing any one of those is not published, and the item it belongs to shows an empty trace instead. Currently 0 reports are in the library. That is the number, not a placeholder for one. Every product page states the absence where the certificate would be.
Independent verification
Where the issuing laboratory publishes its own results portal, every certificate row links straight to the lab’s record. Check us against the issuer rather than taking our copy of the file at face value.
The library is not restricted to certificates we commissioned. If you assay a batch you bought from us, send us the report and it goes in marked as customer-submitted — including when it disagrees with ours. A library containing only self-ordered reports tells you what a seller chose to test, which is a much weaker signal than it looks.
What a purity figure is
The percentage on a certificate is a peak-area ratio from chromatographic separation. It describes the proportion of the analysed sample attributable to the main peak. It is not a statement about anything else — not about identity confirmation, not about endotoxin, not about residual solvents, unless a certificate separately reports those.
Where a listing shows a chromatogram, it is drawn from that item’s certificate: main peak area proportional to the reported figure, residual peaks for the remainder. Where no certificate exists, there is no trace — the panel states the absence instead. That is a real absence, not a styling choice, and today it is the state of every listing.
Storage and handling
- Lyophilised material is held and shipped cold, in insulated packaging.
- Each shipment carries its batch reference on the packing note, and the certificate reference with it once a certificate exists for that batch.
- Storage conditions are stated on a listing where the specification we recorded states them, and left blank where it does not.
What we will not tell you
Nothing on this site describes what a compound does in a body, because these are laboratory reagents and we are not permitted to — nor qualified to — characterise them that way. Listings carry specification, sourcing dates and assay data. Where a compound has a research literature, we link to it and let it speak for itself.
We also do not publish who manufactures the material. That one is a commercial refusal rather than a legal one, and it is stated here because a page about what we check should not be silent about what we withhold.
If you find a claim on this site that crosses that line, it is a defect. Tell us and it comes down.