Surplus vitamin B12 use does not reduce fatigue in patients with Irritable Bowel Syndrome or inflammatory bowel disease: A randomized double-blind placebo-controlled trial

Anne-Marie Scholten, Esther Vermeulen, R.A.M. Dhonukshe-Rutten, Teuni Verhagen, A. V. M. de Visscher, Anouk Olivier, Lilian Timmer, Ben J.M. Witteman