Hundreds if not thousands of years ago a fermented milk product know as Kefir was discovered. The people who drank Kefir daily were healthier and lived longer than their countrymen. Doctors in the region started to study Kefir and used it to treat various medical conditions. Modern research has shown that home made Kefir produced an abundance of probiotics and various vitamins. Probiotics makes up 80% of our immune system. Kefir replenishes our probiotics which modern foods help to destroy.