From all I can tell, I don't think they are particularly constipating. Others, with C, have tried them and things did not get worse. Your reactions may have more to do with your underlying conditions still being addressed or it may be a combination of things. (I stopped using mine for a period before a small surgery and added Caltrate when the D returned. When I went back on the Provex with the extra calcium in my system, I became C for a couple of days. I discontinued the Caltrate and went back to normal.) Perhaps you, too, had added something that constipates or has a high calcium content--cheese, milk, yogurt, etc.Mark