USP <2232>
The USP chapter setting elemental-impurity (heavy-metal) limits for dietary supplements.
USP <2232> is the United States Pharmacopeia chapter that sets limits for elemental impurities - the toxic heavy metals lead, arsenic, cadmium, and mercury - in dietary supplements. It defines the daily-exposure thresholds a compliant product must stay under.
Note that USP limits are generally looser than California's Prop 65 thresholds when converted to per-serving exposure, so meeting USP doesn't automatically make you Prop 65 compliant. Testing is run by ICP-MS.
Related terms
Guides that cover USP <2232>
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Test MethodsUSP 2232 Heavy Metals Testing Explained
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