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p-Mentha-1,3-diene

CAS 99-86-5
42

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

P-Mentha-1,3-diene is a cosmetic ingredient used in product formulations. Its specific function may vary between products. Exercise caution due to limited available safety data.

p-Mentha-1,3-diene (alpha-terpinene) is a monoterpene found in tea tree and other essential oils. The EU's IFRA program has flagged it as a skin sensitizer requiring restrictions in consumer products. While naturally occurring, it lacks adequate safety data for use in leave-on cosmetic formulations without concentration limits.

Known concerns

  • Skin sensitizer (IFRA restricted)
  • Limited safety data for cosmetics
  • Potential oxidation products increase allergen risk

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.