by mukk products are made with added probiotic technology that allows producing natural products without traditional preservatives.  The formulas contain lactobacillus ferment, which provides antibacterial protection and strengthens the skin barrier. Mostly known from the fermentation processes lactobacillus ferment inhibits the growth of other microorganisms, changing the pH to acidic while producing antimicrobial peptides that help to maintain the product and skin microflora. Products preserved with probiotic technology are marked so in the product description.