Science
Mechanism of Action
This extract exerts its effects through several key pathways. As a potent antioxidant, its high content of flavonoids, carotenoids, coumarins, and limonoids effectively neutralizes free radicals, thereby protecting skin cells from oxidative damage. Its anti-inflammatory action is demonstrated by the inhibition of nitric oxide production and the modulation of inflammatory cascades such as the NF-κB and MAPK signaling pathways, leading to a reduction in skin redness and irritation. Furthermore, it functions as a skin-lightening agent by inhibiting tyrosinase, an enzyme crucial for melanin synthesis, which in turn diminishes the appearance of age spots and promotes a more uniform skin tone. Beyond these, it supports skin regeneration, improves hydration by increasing hyaluronic acid, and offers photoprotective qualities against UV-A induced photoaging.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 In vitro assays demonstrated a decrease in melanin synthesis. Clinical in vivo studies involving Citrus Unshiu Peel Extract showed a significant 71% reduction in age spot pigmentation among study participants.
- 02 At an in vitro concentration of 250 µg/mL, a crude extract of immature Citrus unshiu fruits exhibited anti-inflammatory effects in LPS-stimulated RAW 264.7 macrophage cells, inhibiting nitric oxide (NO) production, TNF-α, IL-6, iNOS, and COX-2 expression, without inducing cytotoxicity.
- 03 Fermented dried Citrus unshiu peel extracts suppressed LPS-induced nitric oxide (NO) by 15.4% to 21.9% and inhibited the expression of iNOS, COX-2, TNF-α, IL-6, and PGE2 in RAW 264.7 macrophages. This extract also improved skin moisturizing efficacy in human HaCaT keratinocytes.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The optimal pH range for the stability of Defatted Citrus Unshiu Fruit is not explicitly stated. While 'defatted,' the ingredient may still contain residual volatile fragrance components that could be a source of skin aggravation. For ensuring safety and preventing photosensitization, leave-on cosmetic products incorporating citrus fruit-derived ingredients must be carefully formulated to contain no more than 0.0015% (15 ppm) 5-methoxypsoralen (5-MOP) in the final product.
Safety
Safety Profile
The CIR Expert Panel concluded that Citrus fruit-derived ingredients, including Defatted Citrus Unshiu Fruit, are safe for use in cosmetic products (both rinse-off and leave-on) when formulated to be non-sensitizing and non-irritating. A critical restriction for leave-on products is the limitation of 5-methoxypsoralen (5-MOP) content to 0.0015% (15 ppm) to mitigate photosensitization risk. While 'defatted' may reduce some sensitizing compounds, the SCCS has identified certain Citrus constituents as established contact allergens, warranting careful formulation. No specific FDA cosmetic ingredient status for 'Defatted Citrus Unshiu Fruit' has been identified.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Defatted Citrus Unshiu Fruit is a valuable multi-functional ingredient offering significant skin brightening, antioxidant, and anti-inflammatory benefits, provided formulations strictly adhere to the 0.0015% (15 ppm) 5-methoxypsoralen limit for leave-on products to ensure optimal safety and efficacy.
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