With ulcerative colitis (UC), your body loses many essential nutrients and vitamins it needs to function well. UC can deplete you of things like iron and vitamin D, steal your energy, and hurt your joints. While it's relatively easy for people without UC to get the nutrients and vitamins they need from food, it's difficult for UC patients. Read on for a rundown of supplements you should consider with UC. As always, speak with your gastroenterologist (GI doctor) before taking a new supplement.