What it is
Streptococcus thermophilus ferment is the metabolite-rich product of culturing this lactic-acid bacterium, the same species widely used in food fermentation. In skincare it is included as a conditioning ingredient that can contribute to the skin's feel of moisture and comfort. It is typically a water-phase additive used at modest levels.
Safety & warnings
Ferment ingredients of this kind are generally well tolerated in topical cosmetic use. As a biologically derived material its composition depends on the fermentation and processing, and sensitization is possible in predisposed individuals. It is not an oil and is not considered comedogenic.
Origin & sourcing
Produced biotechnologically by fermenting a medium with Streptococcus thermophilus and collecting the resulting ferment.
Questions everyone asks
What is Streptococcus thermophilus ferment?
It is a skin-conditioning ingredient made by fermenting a culture of this bacterium and collecting the metabolite-rich product.
Is it a live bacteria in the product?
No. It is a processed ferment used as a conditioning ingredient, not a live culture.