I'm not sure about the husks but on wk4 I had awful problems resulting in a trip to the hospital. Since then I've been taking a Colax aloe Vera colon cleanse tablet daily from holland&barret and things are very regular!
sorry I dont know the answer to your question as I have no problems in that department in fact mine goes the other way - just cos I have to be different!! - but hopefully someone will be along soon who knows x
just dont leave the shake sitting around with the powdered husks mixed in, can go a tad sludgy
i used to take pysillium in capsule form from holland and barratt