Baby Safety / Compounds / α-Thujone

Is α-Thujone safe for babies and kids?

Extreme risk for kids

Infants are highly susceptible to α-Thujone due to lower body weight, immature detoxification pathways, and dietary exposure through contaminated grains or breast milk.

What is α-thujone?

The IUPAC name is (1S,4R,5R)-4-methyl-1-propan-2-ylbicyclo[3.1.0]hexan-3-one.

Also known as: (1S,4R,5R)-4-methyl-1-propan-2-ylbicyclo[3.1.0]hexan-3-one, alpha-Thujone, THUJONE, (-)-alpha-thujone.

IUPAC name
(1S,4R,5R)-4-methyl-1-propan-2-ylbicyclo[3.1.0]hexan-3-one
CAS number
546-80-5
Molecular formula
C10H16O
Molecular weight
152.23 g/mol
SMILES
CC1C2CC2(CC1=O)C(C)C
PubChem CID
261491

Risk for babies

Extreme risk

Infants are highly susceptible to α-Thujone due to lower body weight, immature detoxification pathways, and dietary exposure through contaminated grains or breast milk.

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

Regulatory consensus

1 regulatory bodyhas classified α-Thujone.

AgencyYearClassificationNotes
EDC Assessment—Suspected endocrine disruptor

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 α-thujone

  • Food — absinthe, sage, thuja (cedar leaf)
  • Personal Care — essential oils containing thujone (sage, wormwood, tansy)
  • Fragrance — perfume, cologne, scented personal care products, household fragrance products, candles
    Identified in Fragrance Ingredient Safety Priority Research database (2,325 ingredients)

Safer alternatives

Lower-risk approaches that achieve a similar outcome to α-Thujone:

  • Avoidance (no chemical substitute)
    Trade-offs: Direct chemical substitution requires verification that the replacement does not introduce new hazards (regrettable substitution). Conduct full hazard assessment of proposed alternative before adoption.
    Relative cost: 1.2-2×

Frequently asked questions

Is α-thujone safe for kids?

Infants are highly susceptible to α-Thujone due to lower body weight, immature detoxification pathways, and dietary exposure through contaminated grains or breast milk.

What products contain α-thujone?

α-Thujone appears in: absinthe (Food); sage (Food); essential oils containing thujone (sage, wormwood, tansy) (Personal care); perfume (Fragrance); cologne (Fragrance).

What should I do if my child is exposed to α-thujone?

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 α-Thujone in the baby app

Look up products containing α-thujone, compare to alternatives, and explore the full data record.

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Sources (1)
  1. PubChem Compound Database (2026) — database

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 →