I was thinking about Benefiber too. But I know you can take Physillium husk. You can get it at Trader Joe's or any other health store, Vitamin shop, or something. Probably GNC. So weird. On P2 I was so regular. I have pretty severe IBS, so it was a nice change to be regular for once!! But ever since I've been on P3, I've been having trouble going, which is so weird because I'm now eating fats again, and more food. I had to give myself an enema last night... TMI I know, but is what it is . Felt SOOO much better afterwards. So I'm thinking of starting physillium husk.