Caffeine needs no introduction, which is exactly why its presence on research-chemical price lists is mostly about bulk supply and reference standards rather than discovery. The interesting question here is purity per gram, not pharmacology.
As everywhere on this site: the vendor index shows who publishes real testing, and the calculator turns doses into syringe units.
No vendor has published third-party results for this compound yet; rankings appear here the moment the record does.
Nothing on this page is medical advice; compounds shown are sold for research purposes only. Data is aggregated from publicly published third-party results and traces to its source.