Leuconostoc/Radish Root Ferment Filtrate
Natural preservative – the filtrate of radish-root fermentation with Leuconostoc kimchii lactic-acid bacteria. Contains antimicrobial peptides. Used in clean formulas instead of phenoxyethanol and parabens. Weaker than synthetic preservatives and works best as part of a system.
Supporting ingredient
It gives a product its texture, stability or shelf life. It has no claimed effect on the skin, so an efficacy tier does not apply. What is known about its safety is below
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
Leuconostoc/Radish Root Ferment Filtrate is the product of fermenting Raphanus sativus root with Leuconostoc kimchii lactic-acid bacteria (the same used for kimchi). After 24-48 hours of fermentation the liquid is filtered, and short-chain antimicrobial peptides (bacteriocins), lactic acid, and other metabolites remain in the filtrate. INCI: Leuconostoc/Radish Root Ferment Filtrate. Trade name: Leucidal Liquid (Active Micro Technologies). In cosmetics it is used as a natural preservative for clean formulas and products certified by ECOCERT, COSMOS, NATRUE. The main active is a natural peptide with antimicrobial activity against a broad range of gram-positive and gram-negative bacteria. Use levels are 2-4%, noticeably higher than synthetic preservatives, which limits sensorial design (a distinctive fermented smell). Real-world efficacy. In ISO 11930 challenge tests, the filtrate alone passes criterion B (with acceptable microbial growth) but not always A. Reliable clean formulas combine it with other boosters – glyceryl caprylate, phenoxyethanol-free systems, or antimicrobial aromas such as tea-tree oil. Pregnancy safety. Topical use is safe. Systemic absorption through intact skin is minimal. Lactic acid and peptides are natural metabolites. Skin tolerance. Low irritation and allergen potential. Non-comedogenic. Some users may react to the residual fermentation odor. Marketing claims. Manufacturers sometimes position the filtrate as a skin probiotic. But Leuconostoc is not part of the healthy skin microbiome – it is a fermentation bacterium. The filtrate does not change the skin microbiome; it is purely a preservative.
Frequently asked questions
Is Leuconostoc/Radish Root Ferment Filtrate safe during pregnancy?
Leuconostoc/Radish Root Ferment Filtrate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Leuconostoc/Radish Root Ferment Filtrate for?
Leuconostoc/Radish Root Ferment Filtrate suits: normal, dry, combination, oily, sensitive.
What is Leuconostoc/Radish Root Ferment Filtrate and what does it do in cosmetics?
Natural preservative – the filtrate of radish-root fermentation with Leuconostoc kimchii lactic-acid bacteria.
Is Leuconostoc/Radish Root Ferment Filtrate comedogenic?
On the Fulton scale 0/5 – non-comedogenic. For acne-prone skin, a rating of 3 or higher suggests choosing an alternative.
What's the INCI name for Leuconostoc/Radish Root Ferment Filtrate?
The INCI name is Leuconostoc/Radish Root Ferment Filtrate. It may also appear as: Leucidal Liquid, Radish Root Ferment, Filtrado de fermento de Leuconostoc/raíz de rábano.
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Similar role in the formula
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