Science
Mechanism of Action
Oryza Sativa Lees Water delivers a complex array of beneficial compounds to the skin, including amino acids, vitamins (such as Vitamin E), and potent antioxidants like ferulic acid. Its water-soluble carbohydrates and low-molecular-weight constituents act as a mild humectant, drawing moisture into the stratum corneum, and form a lightweight occlusive film to minimize transepidermal water loss. This dual action supports optimal skin hydration and strengthens the natural barrier function. Peptides and enzymes, generated during the fermentation process, can gently facilitate the removal of dead skin cells and promote cellular renewal. Furthermore, this ingredient offers antioxidant defense against free radicals, aids in reducing inflammation, calms irritated skin, and can contribute to a more even skin tone by mitigating hyperpigmentation. It may also stimulate collagen production and help maintain the skin's physiological pH.
Research
Clinical Evidence
Medium confidence1.25%
Key findings
- 01 Red rice fermented by Aspergillus oryzae (RRFA) significantly boosted the water content in a 3D epidermal model, enhancing key moisturizing and barrier-related proteins and genes. A higher concentration of 3% did not yield substantial further improvement, suggesting an effective concentration around 1.25% for hydration and barrier support.
- 02 A topical gel formulation containing 96% rice water was found to be biocompatible with human skin in vitro and exhibited measurable biological antioxidant activity and elastase inhibitory effects, indicating potential anti-aging properties.
- 03 An aqueous extract of rice stem cells demonstrated substantial skin-whitening potential by achieving 85% inhibition of melanin biosynthesis.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Given its aqueous and nutrient-rich composition, Oryza Sativa Lees Water requires broad-spectrum preservation to maintain stability and prevent microbial growth. For optimal clarity in formulations, the incorporation of chelators and maintenance of low ionic strength are recommended, as the ingredient may exhibit hazing in electrolyte-rich systems.
Conflicts
- Electrolyte-rich systems (potential for hazing)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Oryza Sativa-derived ingredients are safe for use in cosmetics when formulated to be non-sensitizing and appropriately preserved. While generally considered non-allergenic, individuals with sensitive skin are advised to perform patch testing. Regulatory guidelines emphasize that pesticide and heavy metal levels in rice-derived cosmetic ingredients must not exceed established limits. The ingredient is broadly regarded as non-toxic.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Oryza Sativa Lees Water is a valuable ingredient, offering comprehensive benefits including pronounced hydration, antioxidant protection, barrier reinforcement, and soothing properties, making it suitable for a broad spectrum of skin types.
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