Science
Mechanism of Action
This extract leverages its high content of flavonoids and polyphenols to exert multiple benefits within the skin. It acts as a powerful antioxidant by actively scavenging free radicals, specifically the superoxide anion, and effectively suppressing the production of reactive oxygen species (ROS). Its anti-inflammatory action is achieved through inhibiting pro-inflammatory cytokines, nitric oxide (NO), inducible nitric oxide synthase (iNOS), and cyclooxygenase-2 (COX-2) in macrophages. Furthermore, it actively addresses hyperpigmentation by inhibiting tyrosinase activity and melanin synthesis, alongside down-regulating key melanogenesis-related gene expression and protein secretion, specifically MITF and TRP-1. The extract also shows promise in mitigating protein glycoxidation and the formation of advanced glycation end-products (AGEs) by scavenging free radicals, inactivating transition metals, interacting with proteins, and trapping reactive α-dicarbonyls. Secondary mechanisms include potential cleansing, astringent, and anti-bacterial effects.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 An in vitro study utilizing a 50% ethanolic extract from dried Myrica rubra leaves and bark demonstrated significant inhibition of tyrosinase activity, reduced melanin biosynthesis, and exhibited superoxide dismutase (SOD)-like antioxidant activity.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Anthocyanins derived from Myrica rubra (fruit/pomace, potentially indicative for similar plant compounds) exhibit sensitivity to heat and light, showing highest degradation at elevated temperatures (e.g., 80°C) and significant loss under UV light. Optimal stability is observed at lower temperatures (e.g., 4°C) and in darkness. Plant extracts rich in phenolic and flavonoid compounds, such as this one, generally maintain good pH stability within a slightly acidic range of 4.2-4.5.
Conflicts
- High concentrations of tannins inherent to Myrica species may potentially induce irritation, particularly for very sensitive skin types.
- Incorporating this extract into cosmetic formulations could lead to reduced product viscosity, impaired foam generation, and diminished capacity to emulsify fatty soils.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has categorized Myrica Rubra Leaf/Stem Extract as having 'insufficient data' for a comprehensive safety assessment. It is also not listed in the United States Food and Drug Administration (FDA) Generally Recognized As Safe (GRAS) list. While secondary sources report concerns related to large internal doses, such as nausea, gastrointestinal disturbances, and potential cancer-causing properties, these are primarily associated with oral consumption and do not directly translate to topical application. However, the overall lack of robust scientific safety evidence for topical cosmetic use necessitates cautious formulation. Notably, a study indicated a water extract of Myrica rubra fruit exhibited less cytotoxicity to melanoma cell lines, though this pertained to fruit extract and cellular models.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While Myrica Rubra Leaf/Stem Extract demonstrates promising in vitro antioxidant, anti-inflammatory, and anti-melanogenesis benefits, the current lack of comprehensive safety data and human clinical efficacy studies means its broader utility and safety in precision skincare warrant further rigorous investigation.
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References
Sources