04/24/2026
Dietary supplement manufacturers often treat contaminant testing as a compliance formality, with price and turnaround being the only differentiating attributes between laboratories. The reality is these products pose a number of analytical challenges, and laboratories make a series of decisions that determine the comparability, reproducibility and defensibility of the data they generate.
Two accredited laboratories can test the same product and produce results that are directionally aligned yet materially different. At higher concentrations, these differences may be inconsequential. At trace levels particularly for heavy metals, pesticides and microbiological contaminants they can determine whether a product is compliant or not with regulatory standards or retailer requirements.
As quality standards rise and data accessibility grows, the risks posed by analytical variability become more visible and problematic. Manufacturers can no longer treat testing as a box to check and need to properly vet the laboratories they use to make sure the data they generate can withstand cross-laboratory comparison and public scrutiny.
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