After eating my favorite breakfast cereal, Post Raisin Bran, I added a serving of Benefiber's Healthy Shape Prebiotic to my Carnation Rich Milk Chocolate Breakfast Essential.Will t... moreAfter eating my favorite breakfast cereal, Post Raisin Bran, I added a serving of Benefiber's Healthy Shape Prebiotic to my Carnation Rich Milk Chocolate Breakfast Essential.Will the Post and Pre cancel each other out?;)