ScienceVitamins - how important are they for us?06:42This browser does not support the video element.Science08/31/2017August 31, 2017Dr. Andreas Pfeiffer is the head of Clinical Nutrition at the German Institute of Human Nutrition (DIfE). He's also the director of the endocrinology, diabetes and nutritional medicine department at the Charité University Hospital in Berlin. Copy linkAdvertisement