Probiotic-crammed foods and pills are marketed as charmers of the human microbiome – and the key to immune, gut and brain health. But how much does the microbiome actually matter, and do probiotics live up to the hype? To learn more we talked with biomedical engineering professor Ilana Brito, immunologist Dr. Yasmine Belkaid, psychiatry professor Ted Dinan, and microbiologist Dr. Namrata Iyer. Learn More