First we encapsulate the Lactobacillus in a water-soluble prebiotic so that we have tiny spheres that contain the live bacteria. The Probiotic Serum is an oil-based serum and into this oil, we distribute the capsules of live Lactobacillus. This protects them from the outside world until they come into contact with water on the surface of your skin. This water will dissolve the capsule and release the living Lactobacillus. The capsule will also provide food for the bacteria to start growing.