Prebiotic/Probiotic/Postbiotic

Bacillus/Folic Acid Ferment Filtrate Extract

INCI: BACILLUS/FOLIC ACID FERMENT FILTRATE EXTRACT

Reviewed by Kate · Last updated 2 Jun 2026

Also known as: Bacillus/folic Acid Ferment Filtrate Extract

A fermented extract with antioxidant and skin-conditioning properties

Best For Skin Types

All, Dry, Sensitive

Addresses

Dryness, Hydration, Sensitivity

Usage Frequency

Daily

What Is Bacillus/Folic Acid Ferment Filtrate Extract?

Bacillus/Folic Acid Ferment Filtrate Extract is produced through the fermentation of Bacillus bacteria in a medium containing folic acid. The fermentation process generates a filtrate—a liquid byproduct—that contains metabolites and compounds created during microbial growth. This extract functions as an antioxidant and humectant in skincare formulations.

Fermentation-derived ingredients have become increasingly common in skincare because the process can generate bioactive compounds that may offer skin-conditioning benefits. This particular extract combines the potential of fermentation science with folic acid's known skin-supporting properties.

Benefits for Your Skin

How It Works

As an antioxidant, this extract works by donating electrons to unstable free radicals, stabilising them and preventing cellular damage. This can be particularly relevant for skin exposed to environmental stressors such as UV radiation and pollution.

The humectant function operates by attracting and binding water molecules to the skin's outermost layers, helping to maintain hydration levels. The skin-conditioning properties likely stem from compounds produced during fermentation, which may support the skin barrier and improve feel and appearance.

Clinical Evidence & References

Evidence specifically investigating Bacillus/Folic Acid Ferment Filtrate Extract in human skin studies is limited. The ingredient appears in a small proportion of skincare products, and robust clinical data comparing it to established antioxidants is not widely available.

What we do know is that fermented extracts generally contain bioactive compounds, and folic acid itself has established roles in skin health and cellular function. However, the specific efficacy of this particular ferment filtrate would benefit from more targeted research before definitive claims can be made about its performance in skincare.

How to Use

This ingredient is typically included in serums, moisturisers, and essences. Since it functions as a humectant and conditioning agent, it works well in formulations designed to hydrate and soothe the skin. Apply to damp skin to maximise its moisture-binding potential, and layer with an appropriate moisturiser if using a serum format.

Safety & Precautions

Generally well-tolerated in skincare formulations. Those with known sensitivities to fermented ingredients or folic acid should patch-test first, though adverse reactions are uncommon.

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