Science
Mechanism of Action
Alpha-Terpinene acts as an antioxidant by readily undergoing autoxidation, thus preventing the degradation of other compounds in a formulation. It also exhibits antimicrobial properties, can reduce inflammation and redness by promoting beneficial skin bacteria, and contributes to balancing skin pH and strengthening the skin's barrier function.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Alpha-Terpinene undergoes rapid autoxidation upon air exposure, forming allylic epoxides and other oxidation products that are strong skin allergens and sensitizers.
Conflicts
- Air/Oxygen
Safety
Safety Profile
While Alpha-Terpinene is Generally Recognized as Safe (GRAS) by the FDA for use as a flavoring agent in food, its suitability for topical applications in cosmetics is highly concerning. In Europe, it is classified as a regulated allergen. Its rapid autoxidation upon air exposure creates potent skin sensitizers, with the oxidized form demonstrating nearly nine times higher sensitization potency compared to pure Alpha-Terpinene, leading to a significant risk of allergic skin reactions and irritation. The EWG notes restrictions for its use, particularly highlighting respiratory concerns in inhalable product forms.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite exhibiting antioxidant and antimicrobial properties, Alpha-Terpinene's rapid autoxidation into potent skin sensitizers, with an almost 9-fold increase in sensitization potential when oxidized, renders it a high-risk ingredient for topical applications, warranting avoidance.
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References
Sources