Does vitamin B3 supplementation improve Crohn's symptoms?

Vitamin B3 (niacin) from Wikipedia

"Food intake in patients with Inflammatory Bowel Disease" in ABCD Arq Bras Cir Dig (2011) [full article]

"There was deficiency in food intake in both CD and UC in active and in remission. These deficiencies
are mainly related to the intake of macronutrients, energy and fiber and micronutrients, including ... niacin...."