Hello Heather. I'm a new member to this site and have purchased both your books. You are a life saver! Since I've changed my diet, my IBS-D has improved dramatically. My IBS-d has been pretty bad since Oct when I was on heavy antibiotics for a severe case of pneumonia. I was wondering if I should be taking acidopholous? I'm not sure if what to buy, how much to take and for how long? Should I check with my doctor first? Thank you for any advice. Regards.