Science
Mechanism of Action
Isoquercitrin operates through several precise pathways within the skin. It acts as an anti-inflammatory by modulating the reduction of cyclooxygenase-2 (COX-2) and key inflammatory cytokines, specifically interleukin-1β (IL-1β) and interleukin-6 (IL-6), particularly in UVB-irradiated epidermal cells. It supports collagen integrity by influencing the transforming growth factor-β/Smad pathway and reducing metalloproteinase-1 (MMP-1) activity in UVA-exposed dermal cells. Furthermore, it strengthens the skin barrier by enhancing moisture retention and decreasing transepidermal water loss (TEWL). Its antioxidant capacity is driven by activating the Nrf2/ARE pathway and suppressing NF-κB-mediated inflammatory responses, which consequently reduces oxidative stress and stimulates collagen production. This comprehensive action contributes to diminishing fine lines, improving skin elasticity, and accelerating wound healing through enhanced angiogenesis and collagen synthesis.
Research
Clinical Evidence
Medium confidence0.5%
Key findings
- 01 Daily topical application demonstrated efficacy in reducing facial trans-epidermal water loss, decreasing skin roughness, and enhancing skin elasticity. (Source: ResearchGate)
Transparency
Dusting Analysis
No specific data regarding 'dusting' characteristics for Isoquercitrin in topical formulations is available in the provided research.
The Formula
Formulation
Stability
Isoquercitrin maintains stability within a pH range of 4.0 to 6.5. It is sparingly water-soluble (1.95 g/L) but exhibits good solubility in glycols, ethoxydiglycol, ethanol, and DMSO (100 mg/mL). Formulations should avoid temperatures exceeding 40°C and highly alkaline conditions, such as pH 8.2, which may compromise its stability.
Conflicts
- Alkaline conditions (e.g., pH above 6.5, particularly pH 8.2)
Safety
Safety Profile
While specific topical cosmetic safety data from CIR, SCCS, or FDA is not available, general research suggests high bioavailability and low toxicity. An acceptable daily oral intake for 95% isoquercitrin was estimated at 5.4 mg/kg/day, and high oral concentrations (up to 5%) in rat/mouse models showed no severe clinical symptoms or mortality over prolonged exposure.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Isoquercitrin is a valuable ingredient offering comprehensive benefits for skin health, including anti-inflammatory, antioxidant, barrier-strengthening, and collagen-protective effects, supported by a promising clinical study at 0.5% concentration, though further topical safety reviews are pending.
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References
Sources