As director of product formulation at Young Living, Marc Schreuder plays a vital role in the development of essential oil blends, nutritional supplements, and personal-care products. Marc has spent more than 14 years studying nutrition, essential oil chemistry, and, more specifically, the effect essential oils have on health. Marc has created a library of more than 2,000 articles on essential oil chemistry and physiological effects. He is co-author of Ningxia Wolfberry: The Ultimate Superfood. Marc is currently consulting with doctors at the U.S. Department of Defense on their first essential oil clinical trial. He also continues to travel all over the world to seek out new essential oils and to uncover the ways in which longevity, diet, and disease are interconnected.