Bacillus subtilis

Bacillus subtilis is a gram-positive, spore-forming bacterium used in cosmetics as a probiotic active ingredient. It produces antimicrobial peptides (bacteriocins) and enzymes that help balance the skin microbiome while providing protective benefits against pathogenic bacteria. Formulators choose this strain for its stability in various formulation conditions, its ability to support skin barrier function, and its dual action of conditioning the skin while providing natural antimicrobial activity without disrupting beneficial skin flora.