Lactobacillus/Milk Ferment Filtrate

Lactobacillus/Milk Ferment Filtrate is a liquid derived from the fermentation of milk by beneficial bacteria, typically Lactobacillus species. The fermentation process breaks down milk proteins and generates bioactive compounds, which are then filtered to create a clear liquid ingredient used in skincare formulations.This ingredient functions primarily as a skin conditioner, meaning it helps to soften, smooth and maintain the skin's moisture balance. It is often incorporated into serums, essences and moisturisers to support overall skin condition.

Fermented milk contains amino acids, peptides and organic compounds generated during bacterial fermentation. These smaller molecular fragments can penetrate the outer layers of skin more readily than whole milk proteins, allowing them to condition and hydrate the epidermis.The ingredient is believed to work partly through humectant action—drawing moisture into the skin—and partly through the presence of lactic acid and other components that may support the skin's natural barrier and microbiome balance.

This ingredient is generally best used as part of a layered routine. Apply it to clean skin before heavier creams or oils, or use it within a serum or essence product. There is no specific upper limit on frequency; most formulations containing this ingredient are safe for daily use both morning and evening, though you should follow the product instructions and your own skin's response.

Generally well-tolerated by most skin types. Those with milk allergies should check the full ingredient list and patch test first, though fermented filtrates carry lower risk than whole milk proteins.