For GI Readers | The HSD
This blogger has had great success in dealing with constipation by supplementing butyrate. Butyrate is produced by intestinal bacteria, the kind that benefits from resistant starches. So I'm going to try the supplement below next month and if it goes well, I'll start introducing resistant starches in flour/powdered forms (have to go refresh my memory in the various RS threads about what is best). This is really promising.
Amazon.com: BodyBio/E-Lyte Butyrate 600 mg 250 caps: Health & Personal Care