Science
Mechanism of Action
This ingredient primarily functions as an insect repellent by forming a superficial barrier on the skin that physically deters mosquitoes and ticks from landing and feeding. Additionally, it operates by masking specific human scent signals that attract these insects. Its potent repellent activity is attributed to its primary active component, p-menthane-3,8-diol (PMD). Beyond its direct repellent action, the broader *Eucalyptus citriodora* oil, from which this cyclized variant is derived, is also being investigated for potential antibacterial, antifungal, and anti-inflammatory benefits.
Research
Clinical Evidence
High confidence30%
Key findings
- 01 Demonstrated efficacy as an insect repellent when formulated as Oil of Lemon Eucalyptus (OLE) or Citriodiol®.
- 02 Proven effective as an insect repellent within a hydroalcoholic solution, exemplified by Mosi-guard® Lemon Eucalyptus Spray Extra.
- 03 Effective as an insect repellent when incorporated into a solid stick formulation, as seen in Mosi-guard® Lemon Eucalyptus Stick.
Transparency
Dusting Analysis
As a primary active ingredient with specific, measurable efficacy as an insect repellent, this ingredient is not typically subject to cosmetic dusting practices.
The Formula
Formulation
Stability
This oily ingredient necessitates co-solvents such as ethanol or isopropyl alcohol for effective integration into water-based spray formulations. Butylene glycol can be utilized to mitigate crystallization. Its formation, derived from *Eucalyptus citriodora* essential oil in an acidic environment (e.g., 0.25% sulfuric acid), implies certain stability or reactivity characteristics in acidic conditions. For optimal shelf life, similar to other essential oils, it should be stored in tightly sealed containers in a cool, dry place, protected from direct heat and light.
Safety
Safety Profile
Oil of Lemon Eucalyptus (OLE), which represents the hydrated, cyclized form of *Eucalyptus citriodora* oil and is marketed as Citriodiol®, is a naturally sourced active substance widely used in insect repellents. It is generally regarded as likely safe for short-term dermal application, having undergone rigorous regulatory review and approval in key global markets including the US, Australia, Canada, and the European Union, which confirm its safe toxicity and environmental profile. While data on contact allergy for the uncyclized *Eucalyptus citriodora* leaf/twig oil is noted as lacking by the European Commission's SCCS, the cyclized component, PMD, is not classified as a skin sensitizer. However, studies in rats at very high dermal doses (5000 mg/kg) have shown significant local irritation, including erythema and edema, resolving within 7 days. It is also identified as an eye irritant.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This ingredient is a valuable, naturally-derived insect repellent with robust clinical efficacy across a range of concentrations and formulations, demonstrating an established safety profile under regulated use.
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