Heavy metal contamination is the risk most consumers never think about, because it is impossible to detect without testing. Lead, arsenic, mercury and cadmium have no taste, no smell and no colour at the concentrations that matter.
Where contamination comes from
Most heavy metal contamination is not added deliberately. It enters through raw materials: botanicals drawn from contaminated soil, minerals from impure sources, or processing equipment that sheds trace metal. Plant-derived and mineral supplements are the most frequently affected.
Why trace amounts still matter
These elements are cumulative. The body clears them slowly, so a low dose taken daily over years can build to a level that a single exposure never would. That is why regulators set limits in parts per billion, and why a product taken every day deserves closer scrutiny than one taken once.
How screening works
Inductively-coupled plasma mass spectrometry, ICP-MS, measures the four regulated elements at trace concentrations in a single run. The result is a simple comparison: measured level against permitted limit, element by element.
For any supplement intended for daily, long-term use, a heavy metal screen is one of the most worthwhile tests a brand can commission, and one of the most reassuring results a buyer can see.