Heavy metals in Cereal Based Infant Formula

Provisional scaffold. This page was created automatically on 2026-05-28 so that an ingested source could route to it. Aliases, category, and the contamination profile have not yet been populated. Content below is minimal until a synthesis pass consolidates the literature for this ingredient.

Reason: heal-gaps: routing_unresolved entry from source igweze2019-trace-metals-infant-formula-nigeria declared ingredient/cereal-based-infant-formula, no close-slug match

Triggering source: Appropriateness of Essentials Trace Metals in Commonly Consumed Infant Formulae in Nigeria

Literature scope

Reported measurements from source notes are below. No typical or upper-tail value is calculated here, and no certification limit is stated. The contamination profile in the page frontmatter is unchanged.

Reported measurements

The 2020 Nigeria note reports cereal-based infant formula (C1 to C7, n = 7). The table header says the group means are mg/kg, equal to ppm, and to multiply by 1000 for ppb, beside cells already printed in ppb. This page repeats both and does not apply a further conversion. Aluminum was 1520 +/- 600 ppb (range 410 to 2350 ppb). Total arsenic was 680 +/- 670 ppb (range 80 to 1560 ppb). Total mercury was 10 +/- 0 ppb (range 0 to 10 ppb). Inorganic arsenic is not measured, and methylmercury is not measured (the note reports total arsenic and total mercury). Milk-based rows and corn-meal rows are not cereal-based infant formula and are not repeated here. Public Health and Paediatric Risk Assessment of Aluminium, Arsenic and Mercury in Infant Formulas Marketed in Nigeria

Cereal-based infant formula, early-life arsenic, and methylmercury demethylation

Cereal-containing formula is an early-life exposure matrix. Suppliers and contract laboratories should keep formula metal specifications separate from infant stool microbiome data. The human arsenic evidence below is urinary total arsenic at 6 weeks, including a formula-fed stratum. It is not an assay of a named cereal-formula powder. Aluminum and mercury are covered only by the hair biomarker study and by the methylmercury demethylation work.

Hoen et al. 2018 related urinary total arsenic at 6 weeks to stool microbiota in 204 infants in the New Hampshire Birth Cohort Study. Urinary total arsenic had median 0.4 µg/L and mean 0.63 µg/L. Feeding-stratified means were 0.5 µg/L in exclusively breastfed infants, 0.9 µg/L in mixed-fed infants, and 1.2 µg/L in formula-only infants. Overall composition was marginally associated with natural-log urinary arsenic after adjustment for feeding and urine specific gravity (pseudo-F 1.85, p = 0.05). The clearest association was in formula-fed males (n = 33, pseudo-F 2.30, p = 0.008). Formula-fed females (n = 23) did not show that association. The direction is an early-life arsenic biomarker toward infant gut microbiota. Urinary arsenic is not a concentration in this ingredient.

Coryell et al. 2018, per WikiBiome source summary, DOI 10.1038/s41467-018-07803-9, found that antibiotic-treated and germ-free mice excreted less inorganic arsenate in stool and accumulated more arsenic in organs than controls. The note states p < 0.0001 at 25 ppm inorganic arsenate and p = 0.025 at 100 ppm for that pattern after cefoperazone. Human stool from five donors protected germ-free mice that lack As3mt, and protection differed by donor. The direction is gut microbiota toward arsenic excretion and acute toxicity. Group sizes are not in the note. The doses are drinking-water experiment doses, not a food concentration.

Xiong et al. 2025, per WikiBiome source summary, DOI 10.1038/s41467-025-60508-8, followed 146 mother-infant pairs, with maternal hair trace elements measured in 119 mothers. Shannon diversity of the infant gut at 3 months correlated positively with selenium and negatively with copper. Bifidobacterium relative abundance increased under high aluminum and high manganese together, so the note does not separate aluminum from manganese. The note states that high copper and arsenic may enrich antibiotic resistance genes. Hair concentrations are not printed. The direction is prenatal trace-element biomarkers toward the infant gut. Hair is not a food sample.

Coe et al. 2023 paired a human cohort with gnotobiotic mice colonized with human microbiota. Gut microbes demethylated a fraction of ingested methylmercury, and the resulting inorganic mercury was preferentially excreted in feces rather than absorbed. Demethylation efficiency varied between people and was associated with taxa that carry mer operon machinery. The direction is gut microbiota toward methylmercury demethylation and elimination. The source page does not print one numeric fraction and does not give a methylmercury concentration in this ingredient.

Study table

What remains uncertain

Hoen and colleagues stratified feeding as breast milk, mixed feeding, or formula. They did not identify cereal-based formula as its own row. Coryell and colleagues used inorganic arsenate in mice. Coe and colleagues studied methylmercury demethylation, which does not answer total mercury in a formula powder. Hair aluminum in Xiong and colleagues is not separated from manganese.

References

Works cited in this page’s text, in first-appearance order. See Sources for this page’s source inventory. Each title links to a source record with bibliographic details, reported findings, and document provenance.

1. Appropriateness of Essentials Trace Metals in Commonly Consumed Infant Formulae in NigeriaIgweze ZN, Ekhator OC, Nwaogazie I, Frazzoli C, and Orisakwe OE · Open Access Macedonian Journal of Medical Sciences 7(23):4168–4175 · 2019 · doi.org/10.3889/oamjms.2019.706Peer-reviewed
2. Public Health and Paediatric Risk Assessment of Aluminium, Arsenic and Mercury in Infant Formulas Marketed in NigeriaIgweze ZN, Ekhator OC, Nwaogazie I, and Orisakwe OE · Sultan Qaboos University Medical Journal 20(1):e63-e70 · 2020 · doi.org/10.18295/squmj.2020.20.01.009Peer-reviewed
3. Sex-specific associations of infants’ gut microbiome with arsenic exposureAnne G. Hoen, Juliette C. Madan, Zhigang Li, Modupe Coker, Sara N. Lundgren, Hilary G. Morrison, et al. · Scientific Reports · 2018 · doi.org/10.1038/s41598-018-30581-9Peer-reviewed
4. The gut microbiome is required for full protection against acute arsenic toxicity in mouse modelsCoryell M, McAlpine M, Pinkham NV, McDermott TR, and Walk ST · Nature Communications · 2018 · doi.org/10.1038/s41467-018-07803-9Peer-reviewed
5. Prenatal exposure to trace elements impacts mother-infant gut microbiome, metabolome and resistome during the first year of lifeXiong S, Xie B, Yin N, Zhu H, Gao H, Xu X, et al. · Nature Communications · 2025 · doi.org/10.1038/s41467-025-60508-8Peer-reviewed
6. Assessing the Role of the Gut Microbiome in Methylmercury Demethylation and Elimination in Humans and Gnotobiotic MiceGenevieve L. Coe, Ian N. Krout, Mason Munro-Ehrlich, Catherine R. Beamish, Daria Vorojeikina, Daniel R. Colman, et al. · Archives of Toxicology, Vol. 97, pp. 2399-2418 · 2023 · doi.org/10.1007/s00204-023-03548-7Peer-reviewed

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