Hi - No idea, but might be difficult to add to the shake mix without it affecting the consistency / taste of the product. I've added a tsp of Fibresure a couple of times when I've felt the need for movement . I'm not sure if Fibresure is allowed, but I have some in the cupboard and can't afford to buy the CD one yet so it will have to do.
Think there is fibre, just perhaps not what you are used to. Peoples fibre tolerance differs, some people need the fibresure others cope fine on the fibre in the shakes.