Protect Yourself from Germs that Enter Your Body Through your Nose and Mouth. This season, defend your ears, nose and throat with BioGuard?, the only probiotic known to work in the mouth by creating a protective shield which takes up all the available space, leaving no room for the bad germs. BioGuard? when taken daily helps boost your immune functions with active probiotic bacteria that provide a natural defense against immune imbalance in the mouth, ?the gateway to your health.? Whether you are at work, school, travel, or in any exposed environment, BioGuard? can provide a natural defense.* With BioGuard, you can safely protect your family from germs that can make you feel miserable.