I take Vitacost's 400 mg magnesium citrate at night with calcium, and vit D for my bones. It helps with my obstipation. How to balance the constipating effect of supplemental calcium with its also being necessary for bone strength is challenging.
My GI rx Motegrity, but I find occasional Miralax and a stool softener plus enjoying plenty of fall fruit is working for the moment.
Can you say more about the quarterly 2 week break from Motegrity?