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BACILLUS/KURODA'S SEA HARE EXTRACT FERMENT FILTRATE.

Valuable / ANTIOXIDANT

A sophisticated marine-derived active produced through the microbial fermentation of Kuroda's Sea Hare proteins. This process transforms complex biological structures into highly bioavailable peptides and oligosaccharides that enhance skin resilience and hydration.

Antioxidant Skin Conditioning Humectant Antimicrobial

Science

The Bacillus fermentation process enzymatically cleaves large marine proteins and polysaccharides into smaller, low-molecular-weight peptides and amino acids. These act as Natural Moisturizing Factors (NMFs) to reduce trans-epidermal water loss while simultaneously scavenging reactive oxygen species (ROS) and providing antimicrobial support to maintain a healthy skin microbiome.


Research

Medium confidence
Effective range 0.01–10%
Optimal

2%

Key findings

  1. 01 In vivo and in vitro patent studies (KR2012169818A3) confirm significant anti-wrinkle effects and oxidative stress protection via ROS inhibition.
  2. 02 Bioactive lectins isolated from the extract exhibit potent antimicrobial activity at concentrations as low as 400 µg/mL.

Transparency

Commonly dusted
Min. effective
0.01%
Red flag below
0.005%

Because efficacy begins at very low thresholds (0.01%), many formulations include it at 'label-only' concentrations below 0.005% to claim marine benefits without providing functional antioxidant or moisturizing value.


The Formula

Solubility
Water
Optimal pH 4 – 6.5
0 7 14

Stability

Optimal bioactivity of enzymes like cellulases is maintained between pH 4.5–5.5. Formulators must avoid heating the phase above 50°C to prevent the denaturation of bioactive marine proteins.

Synergies

  • Hyaluronic Acid
  • Galactomyces Ferment Filtrate
  • Niacinamide

Conflicts

  • Strong oxidizing agents
  • Extremely acidic (pH <3.0) or alkaline (pH >8.0) environments

Safety

CIR Status
Insufficient data
Sensitization risk Low

While the CIR is currently collecting data for a full safety assessment (as of 2025), it remains approved for use in the EU and US cosmetic markets with no specific concentration limits.


Your Skin

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

Our Assessment

Valuable

A high-performance marine biotech ingredient that offers multi-target benefits for barrier repair and oxidative protection, though consumers should look for transparent concentration levels.


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