I hear and see so many things about different pro-biotics these days. There are yogurt drinks and regular yogurt that advertise different types of pro-biotics in addition to their usual "live yogurt culture" attributes.
I also see probiotic supplements meant to help digestive health sold on the aisles of a health food store.
Is this more marketing than anything? Or do we have an actual need for more pro-biotic substances than we're getting in our bodies through regular nutrition? And if so, is it a daily need?