What it does: Along with its benefits for your digestive health, it also produces Vitamin K. In fact, most of the vitamin K in our bodies is made in our intestines by good bacteria. What's more, children who eat lots of bifidobacteria get less eczema and cold and flu symptoms because they "talk" to your immune system, telling it what to ignore and what to fight.
How to get it: Choose fermented milk products like yogurt, kefir and cheese made with bifidobacteria. Breastfeeding is a super source for babies. Good bacteria love fibre, so feed them with prebiotic-rich foods like whole grains, onions, garlic and artichokes.