Shared batch numbers
Sometimes the same batch number turns up on certificates from more than one vendor for the same compound. That overlap is a starting point for a closer look — not a conclusion. Below, each cluster links straight to the vendors and the COAs involved so you can compare them yourself.
One overlap, two explanations
A batch number is assigned by whoever ran the synthesis and the test. When two sellers cite the same one, there are two very different stories that fit the same data — and you can't tell them apart from this page alone.
The ordinary explanation
Many vendors are resellers. Several of them can legitimately stock the same lot from one upstream manufacturer and, quite correctly, pass along that manufacturer's certificate — same batch, same lab, same numbers. Shared paperwork here just means a shared supplier. This is common and entirely above board.
The explanation worth ruling out
The same overlap can also appear when one vendor presents another source's test as if it covered its own product. In that case the certificate may not describe what's actually in the vial you'd receive. The shared number doesn't prove this happened — it just means it's worth checking before you rely on the COA.
Treat each cluster as a question, not a verdict. Open the COAs, check whether the vendors disclose a shared manufacturer, and confirm the certificate names the right product and seller before drawing any conclusion. We surface the signal; the investigation is yours.
No shared-batch clusters on file
Right now we aren't tracking any batch number that appears across more than one vendor for the same compound. When the data turns one up, the cluster — with its vendors and the underlying COAs — will show here.
This page reports overlaps in self-published batch numbers and certificates. A shared batch number is a signal to investigate, not an accusation against any vendor — common-manufacturer reselling produces the same pattern. Names and figures come from vendor- and lab-published documents and may contain errors. Nothing here is medical advice.