Alpha-Terpinene*

ALP

4/10

Concern level

Moderate concern

Alpha-Terpinene is a volatile monocyclic monoterpene hydrocarbon used mainly as a fragrance component and naturally occurring terpene in essential oils. It is chemically unsaturated and prone to air oxidation, which can generate sensitizing oxidation products. In cosmetics it is generally present only at low levels as part of fragrance mixtures rather than as a primary active ingredient.

Pore-clogging

Non-comedogenic

Pregnancy

Caution

Regulatory

No data

Concerns

Essential OilFragranceAllergen

Chemical Properties

Molecular Weight

136.23 g/mol

CAS Number: 99-86-5

Skin Type Compatibility

dry skin2/10

oily skin3/10

sensitive skin1/10

acne prone2/10

mature skin2/10

normal skin3/10

Interactions

incompatible with: oxidizing air exposure, formulations lacking antioxidants, known fragrance allergens, other essential oil/fragrance components in sensitive-skin products

Risks & Warnings

Can be a skin sensitizer and irritant, especially after oxidation on air exposure. Fragrance allergen labeling may be required in the EU. Higher concentrations may increase irritation risk, particularly for sensitive skin. Because it is a volatile hydrocarbon, it is also flammable and should be handled with appropriate precautions in manufacturing.

Vegan Cruelty-Free