Baby Safety / Compounds / Oxalic acid

Is Oxalic acid safe for babies and kids?

Elevated risk for kids

Infants face elevated exposure to Oxalic acid through formula, baby food, and breast milk contamination. Immature hepatic metabolism and higher intake-to-body-weight ratio amplify dose.

What is oxalic acid?

Also known as: ethanedioic acid, Aktisal, Aquisal, Oxiric acid.

IUPAC name
oxalic acid
CAS number
144-62-7
Molecular formula
C2H2O4
Molecular weight
90.03 g/mol
SMILES
C(=O)(C(=O)O)O
PubChem CID
971

Risk for babies

Elevated risk

Infants face elevated exposure to Oxalic acid through formula, baby food, and breast milk contamination. Immature hepatic metabolism and higher intake-to-body-weight ratio amplify dose.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Context-dependent

Pregnancy alters metabolism and increases susceptibility to Oxalic acid. Dietary additives consumed during pregnancy cross the placenta; safety margins for adults may not protect the developing fetus.

No specific reproductive toxicity data identified, but pregnancy-specific safety data is limited for most chemicals. Precautionary minimization of exposure is recommended.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

5 regulatory and scientific bodies have classified Oxalic acid. The classifications differ — that's the data.

AgencyYearClassificationNotes
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 5 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 5 negative reports)
FDA—GRAS as natural food component; no specific food additive approval
ECHA—H302 harmful if swallowed; H312 harmful in contact with skin
OSHA—PEL 1 mg/m3 TWA (respirable)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter oxalic acid

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles
  • Food — processed food, beverages, candy, baked goods
  • Natural Foods — spinach, rhubarb, beets, Swiss chard, star fruit
  • Cleaning Products — Bar Keepers Friend, wood bleach/deck brightener, rust removers, metal polish
  • Industrial — marble polishing, textile bleaching, wastewater treatment (precipitant)
  • Automotive — radiator flush, aluminum brightener

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Oxalic acid:

  • Fragrance-free formulations
    Trade-offs: Consumer preference for scented products
    Relative cost: Lower (ingredient elimination)
  • Essential oil-based fragrances (with disclosure)
    Trade-offs: Natural does not mean safe — many essential oils are skin sensitizers
    Relative cost: 2-5× conventional

Frequently asked questions

Is oxalic acid safe for kids?

Infants face elevated exposure to Oxalic acid through formula, baby food, and breast milk contamination. Immature hepatic metabolism and higher intake-to-body-weight ratio amplify dose.

What products contain oxalic acid?

Oxalic acid appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments); processed food (Food).

What should I do if my child is exposed to oxalic acid?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Why do regulators disagree about oxalic acid?

Oxalic acid has been classified by 5 agencies including EPA CTX / Genetox, EPA CTX / Genetox, FDA, ECHA, OSHA, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Oxalic acid in the baby app

Look up products containing oxalic acid, compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (2)
  1. NIOSH: Oxalic Acid — calcium chelation; calcium oxalate nephrolithiasis; hypocalcemia; rhubarb leaf toxicity; industrial cleaner hazard; primary hyperoxaluria; ethylene glycol metabolism (2019) (2019) — regulatory
  2. CDC/ATSDR: Oxalic Acid Toxicological Profile — plant sources; dietary intake; renal tubular deposition; acute poisoning treatment; industrial uses; calcium oxalate crystals; pediatric rhubarb exposure (2020) (2020) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →