Want a healthier home? You might need to make it a little……germier! But we’re talking about good germs. According to Dr. Jack Gilbert, pediatrics professor from UC San Diego, most microbes in your home aren’t harmful. In fact, a more diverse microbiome can strengthen your immune system and reduce your risk of allergies and asthma.So here are four ways to give your home a healthy microbial makeover: First, open your windows! Fresh air brings in helpful microbes that help train your immune system.