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That makes it easier for contaminants to settle onto the mask before it even touches your skin

One study in the US found elevated levels of mercury and other toxic metals in the blood [6]

Analytical testing confirms above 99.8 percent purity assay content of 10.49 mg RT identification 1.000 spectrum 999 endotoxin detected but below 0.01 EU per mg and no detectable heavy metals or microbial contamination

PMID: 23512829

one or more of these factors could explain these seemingly conflicting results

doi: 10.1016/j.appet.2025.108139 127
