Results of Toxic Element Contamination within Subgroups***.

Category of NHP indicates classification of product in store or company where purchased. This does not necessarily indicate where source materials for the NHPs are initially manufactured or derived.Average daily exposure represents the mean level after all supplements for each category are incorporated.*Limits from U.S. California Proposition 65, [85] and Environmental Protection Agency[102] as per Table 2.**The limit of detection will vary between analytical laboratories and may thus influence the percent with detectable contaminants when levels are at low concentrations.***Tables 3–6 should be interpreted together and in context as there were single outliers (such as the Hg level in one Chinese NHP) that radically skewed the mean and standard deviation.