I use Barlean's flax oil and flax seeds - from my local health food store. I also take flax lignans - so I am definitely getting the fiber in! I knew I had a serious blockage because I was SO constipated and my abdomen was so distended. It took 4 different bowel cleanses, but it finally went down to normal and I can now poop again without laxatives. The fiber is working perfectly now - and it never did before!