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What are the heavy metal limits and which testing standards apply?
Heavy metal testing is performed per batch and reported in the COA. The 60% grade's highest purity (multi-step crystallization) provides the widest margin below heavy metal limits. All limits comply with US FDA, EFSA (EU), and Japan's MHLW.
Heavy Metal Limits (Food Grade)
| Metal | US FDA (ppm) | EU EFSA (ppm) | Japan MHLW (ppm) |
|---|---|---|---|
| Lead (Pb) | ≤0.1 | ≤0.1 | ≤0.1 |
| Arsenic (As) | ≤1.0 | ≤0.5 | ≤0.1 |
| Cadmium (Cd) | ≤0.1 | ≤0.1 | ≤0.1 |
| Mercury (Hg) | ≤0.1 | ≤0.1 | ≤0.05 |
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This article was published on 2026-09-02, and last updated on 2026-09-02. The article will be continuously updated.
