Science
Mechanism of Action
Phloridzin exerts its beneficial effects through several distinct biological pathways. Its antioxidant capacity is derived from its ability to efficiently scavenge free radicals, inhibit lipid peroxidation, and upregulate the activity of intrinsic antioxidant enzymes. For inflammation, it intervenes by suppressing pro-inflammatory mediators and modulating key signaling cascades, specifically the MAPK/NF-κB pathways, which leads to a measurable reduction in inflammatory cytokines such as IL-1β, IL-6, and TNF-α. It confers photoprotection by shielding skin cells from UV-induced damage and diminishing UVB-triggered apoptosis. Furthermore, phloridzin contributes to skin brightening by inhibiting melanin synthesis and tyrosinase activity, and promotes skin self-repair through enhanced proliferative potential of human keratinocytes and fibroblasts, potentially via mTOR pathway regulation and increased vascular endothelial growth factor expression.
Research
Clinical Evidence
Medium confidence0.002%
Key findings
- 01 A concentration of 0.002% effectively stimulated epidermal thickening and boosted the proliferative potential of keratinocytes in skin equivalents. Pure phloridzin demonstrated similar effects, comparable to its presence in Eleutherococcus senticosus extract.
- 02 Demonstrated protective effects against ultraviolet B (UVB) irradiation damage in nude mice, resulting in reduced erythema, epidermal thickening, and skin shedding. It also significantly lowered UVB-induced apoptosis in HaCaT cells.
- 03 Showed an ability to enhance the natural self-repair mechanisms of normal human keratinocytes and fibroblasts.
- 04 In vitro studies identified a non-toxic concentration range and an optimal therapeutic concentration for reducing inflammatory cytokines within a cellular inflammation model, although the precise optimal concentration was not quantified.
Transparency
Dusting Analysis
There is currently no data to suggest that Phloridzin is commonly included in formulations at sub-efficacious concentrations merely for label appeal.
The Formula
Formulation
Stability
Phloridzin exhibits stability challenges, notably precipitating from buffered solutions with pH values between 5 and 6 at room temperature. It is susceptible to hydrolysis into phloretin and glucose upon prolonged exposure to aqueous environments. For optimal preservation, it should be stored in ethanol and protected from light.
Conflicts
- Instability observed in buffered solutions at pH 5-6.
- Aqueous environments and light exposure can lead to degradation.
Safety
Safety Profile
While PubChem classifies Phloridzin with GHS hazard statements H315 ('Causes skin irritation') and H319 ('Causes serious eye irritation'), another source (The Good Scents Company) reports no such classifications. Regulatory bodies have not established a maximum concentration for cosmetic use. In vitro studies have shown no cytotoxicity in ARPE-19 cells at concentrations up to 1 μM.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Phloridzin is a valuable multi-functional ingredient offering significant antioxidant, anti-inflammatory, photoprotective, and skin-repairing benefits, though its formulation stability and potential irritancy warrant precise handling and careful formulation considerations.
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References
Sources