Making kefir at home is super simple and very cost effective. For just the cost of milk and about 5 minutes per day, I make my delicious kefir right in my kitchen. You can purchase commercially produced kefir at grocery stores for double the price of normal milk, but it's not the same as homemade. The commercially produced options are essentially a "kefir-like" manufactured product. The best, real kefir, is made at home.
My most recent fascination with diet, health, and performance has been focused on the human microbiome. Our bodies are the host for trillions of bacteria. We have a positive symbiotic relationship with all these little germs, only a tiny percentage of them have the potential to be harmful. The discovery of antibiotics made a tremendous impact on modern medicine and protecting our health, but the medical community has now recognized that over use of these compounds is having negative consequences.