You know what yogurt is, but have you ever tasted kefir? Es schmeckt gut. I buy a 32 oz bottle for 2.99.

Why You Should Drink Kefir.

"Kefir, which means ‘feel good” in Turkish, is an ancient cultured, enzyme-rich food filled with friendly micro-organisms that help balance your "inner ecosystem” to regain health and rebuild immunity. Kefir's tart and refreshing flavor is similar to a drinking-style yogurt, but it contains beneficial yeast as well as the friendly 'probiotic' bacteria found in yogurt. When used regularly, the naturally occurring bacteria and yeast in kefir combine symbiotically to replenish our intestinal flora and boost our immunity. Among its many restorative powers, kefir will:

Much more information on kefir can be found at Dr. Mercola's site. Type in the keyword 'kefir'.

The Lifeway site lists all their products. I prefer the plain, because it contains no high fructose corn syrup, the main cause of obesity in America. Although it's not healthy for you, it's difficult to find a sweetened product that does not contain it.