More than seventy percent of your immune system is tied to your digestive processes.
The condition of your health is dependent on the condition of the micro-flora in your gut. Unfortunately, the typical person's eating habits, and the consumption of chlorine in tap water, tends to kill off the beneficial bacteria, leaving you more prone to colds and the flu.
When your flora is flourishing, so are you. One of the most powerful ways of ensuring this happens is consuming Probiotics.