Science
Mechanism of Action
This ingredient functions primarily through its monoterpene constituents, notably D-limonene and γ-terpinene. These compounds act as potent free radical scavengers, thereby protecting skin cells from oxidative stress and maintaining skin barrier integrity. Specifically, D-limonene has been shown to shield keratinocytes from UVB-induced photoaging by preventing intracellular free radical formation, preserving barrier function, and reducing cell death. Additionally, the oil provides astringent properties to tone the skin and contains natural exfoliating acids that support skin renewal.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 In vitro studies on lime essential oil (LEO) demonstrated antioxidant activity with DPPH scavenging effects ranging from 10.65% to 66.44% at concentrations of 0.08–3.46 mg/mL, with an IC50 value of 2.36 mg/mL. ABTS scavenging effects were observed from 16.62% to 51.07% at 0.01–0.27 mg/mL, achieving an IC50 value of 0.26 mg/mL.
- 02 Limonene, a key component, has been shown to protect keratinocytes against UVB-induced photoaging, preventing intracellular free radical formation, loss of skin barrier function, and cell death.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
As a hydrophobic and volatile essential oil, Citrus Aurantifolia Peel Oil typically exhibits an acidic intrinsic pH, around 3.47. Its major component, Limonene, is susceptible to degradation by heat and light. It is recommended to incorporate the oil during the cool-down phase of a formulation to minimize thermal exposure. Notably, distilled lime oil is generally not phototoxic, distinguishing it from some other citrus oils and making it a more suitable consideration for leave-on applications.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Citrus Aurantifolia Peel Oil is safe for use in cosmetic products under specific restrictions: finished products, excluding rinse-off items, must not exceed 0.0015% (15 ppm) 5-methoxypsoralen (5-MOP), and formulations must be non-sensitizing and non-irritating. Formulators are advised to monitor levels of constituents like limonene, citral, and furocoumarins to prevent sensitization. The European Commission's Scientific Committee on Consumer Safety (SCCS) identifies this substance as an established human contact allergen. The US FDA recognizes it as Generally Recognized as Safe (GRAS) as a food additive.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its antioxidant properties, Citrus Aurantifolia Peel Oil is an established human contact allergen with moderate irritancy potential and significant formulation restrictions, deeming it unsuitable for precision skincare applications.
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