It’s actually pretty common. Diluting things is hard. Not hard like “scientists still aren’t sure how to do it properly”, but hard like “you have to have a brain and use it”. If you reuse containers or stirring instruments for multiple stages of the dilution you can easily get cross contamination at levels much higher than your simple dilution ratio would suggest. Woo practitioners are also likely to reject the techniques that are developed to prevent this such as using “unnatural” non-porous, non-absorptive materials like porcelain and stainless steel and aggressive washing procedures, either to enhance the woo or simply because they are more expensive. Licensed pharmaceutical manufacturers are required to have strict procedures and testing to make sure that the concentration of active ingredients is correct, but fake medicine is not regulated, so these products can be made in someones kitchen. Their quality assurance department consists of the graphic designer who puts “high quality” on the label.
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