Numbuzin No.3 Skin Softening serum has an impressive list of ingredients, with two popular fermented ingredients doing the bulk of the heavy lifting - Bifida Ferment Lysate and Galactomyces Ferment Filtrate. The use of fermented ingredients in skincare has become increasingly popular in recent years. The ingredients are packed with all of the good things, as the process of fermentation naturally produces vitamins, amino acids and antioxidants. It also breaks down molecules, making them smaller and easier for the skin to absorb.