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‘Right to Repair for Your Body’: The Rise of DIY, Pirated Medicine
(www.404media.co)
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What can be used to detect impurities at those level? Maybe there is an additional machine needed that can also be built in a garage.
The industry standard is HPLC (high performance liquid chromatography). Those things go for tens of thousands of dollars up front, plus maintenance and consumables.
If there was a less costly way of doing it, you bet companies would have settled on that by now.