Hi, actually I do not have CF, but found you message due to the constipation issue.
I had severe constipation due to parasites. LBB helped me, but I didn't have to use it too much, so I just used the pkgd. Dr. Christoper stuff.
I looked at the site you mentioned......you may want to check out the Ask Barefoot forum here, and his online store, oldfashionedspices.com. It seems to be the souce of product for your vendor, and his prices are cheaper.