Prebiotic/Probiotic/Postbiotic

Bacillus/Sea Salt Ferment Filtrate

INCI: BACILLUS/SEA SALT FERMENT FILTRATE

Reviewed by Kate · Last updated 2 Jun 2026

Also known as: Bacillus/sea Salt Ferment Filtrate

A fermented ingredient that conditions skin through microbial metabolites

Best For Skin Types

All, Oily, Combination

Addresses

Hydration, Dryness

Usage Frequency

Daily

What Is Bacillus/Sea Salt Ferment Filtrate?

Bacillus/Sea Salt Ferment Filtrate is produced by fermenting sea salt using Bacillus bacteria, then filtering the resulting liquid to isolate the bioactive compounds. The fermentation process generates metabolites—small molecules produced by the microorganisms—that are retained in the final ingredient.

In skincare formulations, this ingredient functions primarily as a skin conditioner. The metabolites from fermentation may include amino acids, organic acids, and other compounds that interact with the skin's surface to influence hydration and texture.

How It Works

Fermentation generates metabolites that are smaller and potentially more bioavailable than the original ingredients. These compounds can interact with the stratum corneum (the skin's outer layer) to modify how water is retained and how the skin feels to the touch.

The exact mechanism depends on which metabolites are present in significant quantities, which can vary between batches and production methods. This is one reason why fermented ingredients remain an area of active research in cosmetic science.

Clinical Evidence & References

Published research specifically on this ferment filtrate is limited. General evidence supports the use of fermented ingredients in skincare for their conditioning properties, though most studies examine fermented extracts rather than standardised filtrates.

Anecdotal reports suggest this ingredient is well-tolerated by most users, but formal clinical data on efficacy and safety in humans would strengthen confidence in its benefits. If you have particularly reactive skin, patch testing is always advisable.

How to Use

This ingredient is typically incorporated into serums, toners, or lightweight moisturisers at relatively modest concentrations. It works well in layered routines and can be used daily as part of your regular skincare. If your skin feels tight or uncomfortable after use, reduce frequency or discontinue, as some users report this ingredient may potentially exacerbate dryness in sensitive formulations.

Safety & Precautions

Generally well-tolerated. However, fermented ingredients may occasionally trigger sensitivity in those with reactive skin, and some users report increased dryness; patch test if you have a history of reactions to fermented products.

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