Science
Mechanism of Action
This extract primarily functions as a humectant, attracting moisture to the stratum corneum to minimize transepidermal water loss and promote sustained hydration. Its antioxidant capacity stems from a complex of flavonoids, terpenes, linalool, vitamin C, and folic acid, which neutralize free radicals and protect against oxidative stress. Furthermore, it exhibits anti-allergic and anti-inflammatory effects by inhibiting IgE-mediated cutaneous reactions and improving symptoms of atopic dermatitis. Skin brightening is achieved through the inhibition of tyrosinase activity and melanogenesis, attributed to flavanone glycosides such as naringin and neohesperidin, and it has demonstrated an ability to prevent UVB-induced pigmentation. The extract may also contribute to enhanced blood fluidity, potentially benefiting skin issues related to microcirculation.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 A 50% ethanolic extract inhibited IgE-mediated cutaneous reactions and reduced ear swelling in mice, indicating significant anti-allergic effects.
- 02 Application of immature fruit extracts in skincare improved atopic dermatitis symptoms in 76% of patients.
- 03 A 50% ethanolic extract showed significant tyrosinase inhibitory and antioxidant activity (SOD-like and DPPH radical-scavenging). It inhibited melanogenesis in cultured murine B16 melanoma cells and demonstrated in vivo preventive effects against UVB-induced pigmentation in brownish guinea pigs.
- 04 A liposomal-encapsulated blend containing citrus extracts, used at 1%, showed marked skin brightening effects on Caucasian skin over a 56-day period.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
No specific optimal pH range for stability has been identified for the pure extract, though citrus extracts are generally acidic. Stability in cosmetic formulations has been demonstrated for blends of citrus extracts.
Conflicts
- Must be meticulously formulated to be non-sensitizing and non-irritating.
- Leave-on products containing citrus fruit-derived ingredients must not exceed 0.0015% (15 ppm) 5-methoxypsoralen (5-MOP) due to potential phototoxicity.
- General caution is advised for sensitive skin due to the potential presence of fragrance allergens or phototoxic compounds from essential oil components.
- As a humectant, it is optimally applied before occlusive oil-based emollients to maximize its hydrating benefits.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that citrus fruit-derived ingredients, including Citrus Hassaku Fruit Extract, are safe for use in both rinse-off and leave-on cosmetic products when precisely formulated to be non-sensitizing and non-irritating. For leave-on applications, formulations must not contain more than 0.0015% (15 ppm) 5-methoxypsoralen (5-MOP) to mitigate phototoxic potential. Essential oils, oleoresins, and natural extracts from some citrus fruits are Generally Recognized As Safe (GRAS) for food use by the FDA. No specific SCCS status was found.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Citrus Hassaku Fruit Extract is a versatile ingredient offering significant benefits in hydration, antioxidant protection, skin brightening, and soothing properties, making it a valuable addition to precision skincare formulations.
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