Get a Free 5ml Mini Now Free 5ml Mini With Every Order of The Mantle

ASPERGILLUS/SACCHAROMYCES/IPOMOEA BATATAS ROOT FERMENT LEES.

Valuable CAS - / SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

A potent postbiotic residue derived from the traditional Japanese fermentation of purple sweet potato by specialized microorganisms. This nutrient-dense 'Imo Shochu' lees extract is rich in bioactive peptides and organic acids, engineered to fortify the skin's moisture barrier and enhance natural luminosity.

Skin conditioning Humectant Antioxidant Barrier repair Brightening

Science

This multi-functional ferment acts on several biological pathways: it upregulates Hyaluronan Synthase (HAS) to boost endogenous hydration, stimulates mRNA expression of crucial tight-junction proteins like ZO-1 and Claudin-1 to repair the skin barrier, and inhibits tyrosinase activity to modulate melanin production. Furthermore, its organic acid content provides antioxidant protection while promoting extracellular matrix integrity.


Research

High confidence
Effective range 1–5%
Optimal

2.5%

Key findings

  1. 01 Demonstrated significant induction of hyaluronic acid production and barrier protein synthesis at 1-5% concentrations.
  2. 02 Inhibition of tyrosinase and melanin generation confirmed in clinical whitening evaluations at a 5% dosage.
  3. 03 Human dermal fibroblast protection and collagen promotion observed at 2% concentration via antioxidant pathways.

Transparency

Commonly dusted
Min. effective
1%
Red flag below
0.5%

Due to its complex name and exotic 'J-Beauty' appeal, it is often included at minute levels (below 0.5%) for marketing claims. A minimum of 1.0% is required to trigger measurable physiological benefits for skin barrier and hydration.


The Formula

Solubility
Water
Optimal pH 4.5 – 6.5
0 7 14

Stability

Highly stable in aqueous systems; should be incorporated during the cooling phase (below 40°C) to maintain the structural integrity of its bioactive peptides and enzymes.

Synergies

  • Niacinamide
  • Ceramides
  • Hyaluronic Acid
  • Vitamin C

Conflicts

  • Alkaline formulations (pH > 8.0)
  • High-proof ethanol concentrations

Safety

CIR Status
Safe as used
Max tested
100%
Pregnancy
Safe
Sensitization risk Low

Classified under generally recognized as safe (GRAS) yeast-derived ferments; non-irritating and suitable for long-term topical use.


Your Skin

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

Our Assessment

Valuable

An exceptional multi-tasking postbiotic that bridges the gap between traditional Japanese fermentation wisdom and modern barrier-repair science.


Related

Finding similar ingredients…


References