Baby Safety / Compounds / 4-Methylbenzylidene camphor (4-MBC)

Is 4-Methylbenzylidene camphor (4-MBC) safe for babies and kids?

High risk for kids

Infants are more vulnerable to 4-Methylbenzylidene camphor (4-MBC) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What is 4-methylbenzylidene camphor (4-mbc)?

CAS number
36861-47-9
Molecular formula
C18H22O
Molecular weight
254.37 g/mol
SMILES
CC1(C2CCC1(CC2=O)/C=C/C3=CC=C(C=C3)C)C
PubChem CID
62311

Risk for babies

High risk

Infants are more vulnerable to 4-Methylbenzylidene camphor (4-MBC) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

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

Elevated risk

Thyroid disruption affects fetal neurodevelopment. Transferred via breast milk.

Regulatory consensus

2 regulatory and scientific bodies have classified 4-Methylbenzylidene camphor (4-MBC). The classifications differ — that's the data.

AgencyYearClassificationNotes
EU2009Permitted in cosmetics at max 4% (under review for EDC properties)
Denmark2015Recommended avoidance in children's sunscreens

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 4-methylbenzylidene camphor (4-mbc)

  • Consumer Product

Safer alternatives

Lower-risk approaches that achieve a similar outcome to 4-Methylbenzylidene camphor (4-MBC):

  • Zinc oxide (mineral)
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 1.2-2×
  • Tinosorb M (non-EDC organic filter)
    Trade-offs: Alternative approach; specific tradeoffs depend on application context, scale, and regulatory requirements. Full hazard assessment of alternative recommended before adoption to avoid regrettable substitution.
    Relative cost: 2-5× conventional

Frequently asked questions

Is 4-methylbenzylidene camphor (4-mbc) safe for kids?

Infants are more vulnerable to 4-Methylbenzylidene camphor (4-MBC) than children or adults due to immature hepatic/renal clearance, higher intake-to-body-weight ratio, rapid organ development, and increased gastrointestinal absorption.

What should I do if my child is exposed to 4-methylbenzylidene camphor (4-mbc)?

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.

See 4-Methylbenzylidene camphor (4-MBC) in the baby app

Look up products containing 4-methylbenzylidene camphor (4-mbc), compare to alternatives, and explore the full data record.

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Sources (1)
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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 →