Hi mala407,
Welcome to HealingWell!

What do you mean you are on the borderline of colitis? Have you been scoped? Did they find inflammation and take biopsies?
You may have already come across a post suggesting this... Calcium. It works great for helping control D. There are many of us on this board who take Caltrate + Vitamin D to help control their daily D.
Hope to see you around the boards...