I've had a hard time finding supplements to really help with bowel movements. I drink a lot of water everyday and usually exercise (although I've slacked off on that now that I work and go to school full time. Ugh.) I also drink my fiber or take tablets when I can't drink it. I would like to take a multivitamin, but most of those stop me up too. I've found whole foods vitamins are ok, but they are super expensive and usually a dose is 3-6 capsules. I drink fennel, peppermint, or ginger tea, depending on what I need it for.
Strangely though, I don't have a problem with dairy. The only time I really need to be careful is with yogurt. If I don't eat some sort of soluble fiber with it, I will get cramps. Now if I try to drink more than a serving of milk or eat a bunch of cheese without any fiber, I will pay for it, but usually I know how much is ok. Having the soluble fiber buffer really helps for me. Dairy does make it harder for me to "go" though, so I do try to make sure I take lots of fiber during the day.
This is probably moreinfo than was needed to respond, but I thought I'd share :-)
Time flies like an arrow. Fruit flies like a banana.