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ASPERGILLUS/RICE FERMENT LEES EXTRACT FILTRATE.

Valuable / SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

A high-precision bioactive filtrate derived from the nutrient-dense byproduct of rice fermentation, known as sake lees. This ferment serves as a multi-functional repair agent that stabilizes the skin's structural proteins while enhancing natural luminosity through advanced molecular pathways.

Skin-conditioning Barrier Repair Anti-glycation Humectant Brightening

Science

It functions by stimulating the synthesis of filaggrin—a critical precursor to Natural Moisturizing Factors (NMF)—and essential ceramides to fortify the epidermal barrier. Additionally, it acts as a tyrosinase inhibitor to regulate melanin production and employs anti-glycation properties to prevent the cross-linking of proteins, thereby maintaining skin elasticity and preventing yellow-toned sallowness.


Research

High confidence
Effective range 0.5–3%
Optimal

1%

Key findings

  1. 01 Application of 1% concentration demonstrates a statistically significant increase in ceramide synthesis and filaggrin production over a 4-week period.
  2. 02 At 3%, the extract provides measurable anti-glycation benefits and inhibits tyrosinase activity to reduce Advanced Glycation End-products (AGEs).
  3. 03 In vitro analysis at 0.5% confirms the inhibition of pro-inflammatory cytokines and provides significant protection against oxidative stress in human keratinocytes.

Transparency

Commonly dusted
Min. effective
0.5%
Red flag below
0.1%

While frequently used in 'ferment essences' for marketing appeal, concentrations below 0.5% are unlikely to trigger the barrier-repair or anti-inflammatory benefits observed in clinical settings.


The Formula

Solubility
Water
Optimal pH 4 – 6
0 7 14

Stability

Heat-sensitive; bio-active peptides may degrade if exposed to temperatures exceeding 60°C. Should be stored in cool, light-protected environments to ensure filtrate clarity.

Synergies

  • Niacinamide
  • Ceramides
  • Hyaluronic Acid
  • Panthenol

Conflicts

  • High concentrations of ethanol
  • Strong oxidizing agents

Safety

CIR Status
Safe as Used (within the Oryza Sativa-derived category)
Max tested
5%
Pregnancy
Safe
Sensitization risk Low

Belongs to the broader rice-derived ingredient group reviewed by CIR in 2006 and 2021, confirmed as safe for topical cosmetic use.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

A highly effective bio-ferment for addressing both barrier deficiency and skin dullness through targeted peptide and enzymatic action.


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