To answer this question requires a refresher course in our immune system. Many people are surprised to learn that we have approximately ten times more bacterial cells, about 100 trillion total, in and on our body than actual human cells. The reason being is that bacteria are much smaller than human cells. The why we even have bacteria is because bacteria play many vital roles in our health and wellness.
There is good bacteria and bad bacteria. Good bacteria is good because they play a healthy role and provide many functions in our body. For example, Vitamin K, which is necessary for normal blood-clotting, is produced in the intestines by the good bacteria by about the eighth day after birth. Hence, Vitamin K shots/eye drops are not necessary if the newborn is full-term, the mother eats leafy green veggies along with healthy fats and breast-feeds her newborn. Then all that is left is to patiently wait for the natural maturation of bacteria to take place.
Good bacteria are also vital in the breakdown and digestion of our food and helps prevent disease by keeping the bad bacteria in check. More and more research is needed on bacteria but what is known is that not everyone has the exact same bacterial blueprint.
As a result, we are bio-chemically individualized by our bacterial signature. This is why the one size fits all in healthcare does not fit at all.