Lactobacillus ferment is a probiotic, with a number of skin benefits. It was first shown by Estee Lauder to protect against environmental aggressors by supporting DNA repair within the cell. It was later shown to have powerful anti-inflammatory and antimicrobial effects, with research indicating it being particularly beneficial for those with acne or rosacea. The manufacturer of the ingredient, Barnet, has confirmed the mechanism of this is by suppressing the growth of harmful bacteria associated with these conditions, and encouraging the diversity of growth of beneficial skin microbiota.

Lactobacillus ferment sits in a class of probiotic ingredients which can be found on ingredients lists as bifida ferment lysate and lactococcus ferment lysate.

This ingredient is generally compatible with most skincare ingredients and can be used morning or evening.

• CosIng - European Commission Cosmetic Ingredients Database