I found out about DanActive Probiotics from the Internet. I went to WholeFoods and bought Four 3.3 oz bottles for $2.60. Dannon makes a claim that if you drink 1 bottle a day for 30 days and it doesn't make you feel better the will refund you with a maximum refund of $17.96. Hmmm 30/4 X 2.60 = $19.00 dollars. Well I guess you get most back. On the package they state about 70% of your immune system is in the digestive tract. Has the exclusive L. casei Defensis cultures. 10 billion per bottle. Clinically proven to help naturally strengthen your bodys defense system. Well I'm on day 1 and 29 days to go. See what happens.