Dealing with slow transit constipation -->
Things that have worked for me:
1. Avoiding high doses of supplements that slow down digestion - like Melatonin. (Low doses are supposed to speed it up, but I have not tried that.)
2. Avoiding fiber supplements that also state they help curb appetite. They do that by slowing down your digestion.
3. Looking at all of one's supplements and medications to see if one or more slows down digestion.
4. Taking mineral oil for constipation, as previously mentioned, at a dose appropriate to you (start small) to keep things slipping along, at the first sign of constipation.
5. Taking Bragg's Apple Cider Vinegar with meals, best on your food, 1/2 teaspoon to start. The vinegr seems to speed digestion and be mucus-forming and stool-softening. It is also sold in pill form, which I have not tried.
6. When one's gut feels like it is cement and not moving, taking the maximum dose of OTC laxative/stimulants or your meds according to directions. When my gut was frozen, that was OTC Colace 2-in-1.
7. Self-massage to help move stuck stool in rectum. Lie on one's left side for a gravity assist. Also nice at bedtime to move things along. See England's National Health Service's: https://www.wchc.nhs.uk/content/uploads/2019/12/Self-abdominal-massage.pdf.
8. Explore one's diet. Grains, Fat, Dairy, Sweets, Meat, FODMAP, Hi-Fiber , low fiber, liquid intake vs. solid food.
9. Get enough sleep.
10. Deep (diaphragm) breath for stretches of time.
I appreciate these good ideas, @researchmaven, I'm sure they will help many of us who are trying to cope with slow transit constipation.