What it is
This ingredient is the filtered liquid fraction left after Bacillus bacteria are fermented in a mineral-rich sea salt medium. The fermentation generates a mixture of small peptides, amino acids, and other metabolites that contribute moisturizing and skin-conditioning effects. It is used in leave-on formulas as a supporting conditioning agent rather than as an active sunscreen component.
Safety & warnings
Ferment filtrates are generally well tolerated in cosmetic use. As a fermentation-derived material it carries the theoretical potential for residual proteinaceous components, so individuals with known sensitivities to fermented ingredients may wish to patch test.
Origin & sourcing
Biotechnological, produced by microbial fermentation of a Bacillus species in a sea salt-based medium, then filtered.
Questions everyone asks
Is this a sunscreen UV filter?
No. It is a fermentation-derived conditioning ingredient and does not absorb or reflect UV; it plays a supporting role in the formula.
What does the sea salt contribute?
The sea salt provides minerals as part of the fermentation medium, helping shape the metabolite profile the bacteria produce during culturing.