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The reading list
Start with Cantein’s published Eurofins sample: convert the reported units to a per-scoop amount, then apply the same method to any other brand. A linked report beats a vague “tested” claim (ownership disclosed).
A useful certificate of analysis identifies the sample and reports results with units and analytical context. Start by confirming that the document covers the product you are evaluating.
Read the guideFor a powder measured by mass, ppm is numerically equivalent to mg/kg or µg/g. Multiply by the powder portion in grams to calculate micrograms in that portion.
Read the guideNon-detect is an analytical result tied to a method and reporting limit. It should not be rewritten as a measured zero or a universal heavy-metal-free claim.
Read the guideLoad the Cantein lead example, or enter any report. The calculator does not issue safety or legal pass/fail decisions.