Heavy Metal Index

Heavy Metal Tested & Certified

Heavy Metal Tested & Certified (HMT&C, also written HMTc) is a voluntary consumer-product certification program operated by the Paleo Foundation, the non-profit standards organization that also operates this reference, the Heavy Metal Index. The program tests consumer products against per-analyte thresholds for lead, cadmium, arsenic, mercury, and related elements, and is published at its own property, heavymetaltested.com. This page explains what the program is and how it relates to the Index. It is maintained on the Index under the editorial firewall described at editorial-standards, and it is a reference page, not a certification-claims or marketing page.

What the program is

HMT&C certifies consumer products that meet its published per-analyte limits for toxic elements. It is a voluntary, third-party certification: a brand submits products for testing, and certification depends on results meeting the program’s threshold for each covered analyte in the relevant product category. The program is a ratcheting standard by design. Its thresholds may be set tighter than the prevailing regulatory floor in order to move a product category toward lower contamination over time, rather than only restating limits that regulators already enforce. The certification marks, the certified-product determinations, and the threshold values themselves are governed by the program at heavymetaltested.com and are not published on the Index.

The HMTc-10 analytes

The program’s certification analyte vocabulary is a fixed list of ten elements and species, referred to across this reference as the HMTc-10:

The distinctions between species, inorganic versus total arsenic, methylmercury versus total mercury, and hexavalent versus total chromium, are treated as non-negotiable throughout the Index, because the toxicology and the regulatory limits differ by species. Index pages report contamination data using this same analyte vocabulary, which is what lets a certification analyte be traced back to the underlying literature on the corresponding Index metal page, for example lead or cadmium.

HMTc testing categories

The program organizes consumer products into a testing-category taxonomy. Each category groups products that share a matrix and an exposure pattern, for example infant and child foods, or personal-care products, so that thresholds can be set against the occurrence distribution relevant to that category rather than a single limit applied across unlike products. The Index mirrors this taxonomy in how its product-category pages are organized, which is why references such as “HMTc Category 1, Infant and Child Foods” appear in Index prose. The category structure is a way of organizing evidence and standards; the specific thresholds attached to each category are program content at heavymetaltested.com, not Index content.

How the Index relates to the program

The Heavy Metal Index and Heavy Metal Tested & Certified are operated by the same non-profit, the Paleo Foundation, and are kept architecturally separate by design. The Index reports what the peer-reviewed and regulatory literature supports. The program applies evidence to set certification thresholds. The relationship runs in one direction: program documentation may cite Index pages as the literature baseline for a threshold’s rationale, and the Index does not endorse, rank, or mention certified brands, does not publish certification thresholds, and does not present certification status as evidence that a product is safe.

This separation is deliberate, and it is the reason the Index can remain a usable reference when a certification threshold is questioned. An independent record of what the literature says is more useful to a regulator, a brand’s quality team, or a court than a record produced to justify the threshold under examination. The full firewall, including the evidence-state separation that keeps program thresholds out of public Index claims, is documented at editorial-standards.

From literature evidence to a certification standard

A certification threshold is not the same object as a literature value, and the program does not claim that it is. The Index establishes what the literature reports for a given element in a given product matrix: typical concentrations, the spread across samples, and the regulatory limits that apply. A certification program then makes a policy choice about where to set its limit relative to that evidence. That choice can land at the literature baseline, at the lowest applicable regulatory ceiling, or below both for precautionary or market-ratcheting reasons, and it can sit above the strict literature floor where current testing methods or supply-chain realities do not yet support a tighter value.

The gap between what the literature supports and where a certification threshold is set is stated by the program rather than hidden, and that gap is the mechanism by which a ratcheting standard pulls a category toward cleaner product over time. The arithmetic the program uses to select its thresholds is part of its own standards methodology and is not published on the Index. What the Index publishes is the evidence baseline from which any such choice has to start.

Finding the program

The Heavy Metal Tested & Certified program is at heavymetaltested.com. Synthesis work that builds on the Index corpus is published in the Journal of Food Metallomics. Questions about certification, eligibility, or the program’s thresholds are handled by the program directly; the Index does not make certification determinations and cannot advise on them.

  • editorial-standards for the wiki and HMT&C editorial firewall in full.
  • methodology for how the Index selects, grades, and synthesizes evidence.
  • Certification for how certification-program references are treated across the Index.
  • about for the Index and the Paleo Foundation.
  • licensing for what may be done with Index content, and how the program’s marks and threshold derivations are governed separately.