The certificates of analysis provide little assurance. There's no clarity on the testing methods used, what was specifically tested, or the context of the results. They simply state something like 98%, but what does that actually mean? Is it an assay, and on what basis? Is it HPLC, NMR, or a traditional titration method? What about the remaining 2%? There's no information on qualitative analysis either. It seems like they just measured something without adequate explanation. How does this differ from the certificates given by the manufacturer?
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