Concentrations of Heavy Metals in Processed Baby Foods and Infant Formulas Worldwide: A Scoping Review

This scoping review synthesizes published literature on heavy metal contamination in processed baby foods and infant formulas globally. The review maps the breadth of evidence on arsenic, cadmium, lead, and mercury across product categories, geographic regions, and food matrices, identifying gaps in coverage and highlighting contamination patterns across the literature.

Key numbers

Scoping reviews synthesize rather than extract single values. Metal concentrations in processed baby foods vary substantially by product type, ingredient source, and geographic origin. The review documents the geographic distribution of evidence and identifies which product categories have been well-characterized versus understudied.

Methods

Systematic literature search across published studies measuring one or more of arsenic, cadmium, lead, or total mercury in processed infant foods, infant formula, or complementary foods intended for infants and young children. Geographic scope is global. Search strategy and inclusion/exclusion criteria follow standard scoping review methodology (Arksey & O’Malley framework or successor). Data extraction captures study location, product type, metals measured, sample sizes, contamination values, and analytical methods.

Implications

Identifies which food categories and geographic regions have strong evidence for heavy metal contamination (well-covered in literature) and which remain understudied. Provides a foundation for future systematic reviews and meta-analyses by mapping the evidence landscape. Highlights methodological variation across studies that affects comparability of findings across regions and product types.

Wiki pages updated on ingest

• ingredients/baby-food.md
• ingredients/fish.md
• ingredients/rice.md
• metals/arsenic.md
• metals/cadmium.md
• metals/lead.md
• metals/mercury.md
• products/infant-formula.md

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## Page history

The five most recent substantive edits to this page. The full version history lives in [git](https://github.com/paleofoundation/heavymetalindex); when DOI minting comes online (see [[../docs/schemas/index.md|schema docs]]), each entry below will also link to a version-pinned DataCite DOI.

| Commit | Date | Description |
| --- | --- | --- |
| [ce3e07c](https://github.com/paleofoundation/heavymetalindex/commit/ce3e07c) | 2026-05-28 | activation \| Vercel DATACITE env slots set, curators.md filled with founder entry + six scoped reviewer invitations, peer-review onboarding playbook drafted |
| [51400b9](https://github.com/paleofoundation/heavymetalindex/commit/51400b9) | 2026-05-28 | audit-queue: gasparik2017-wild-boar-slovakia-metals audited-revised |
<!-- END: hmi-page-history -->