Inborn errors of metabolism (IEMs) include a large number of rare genetic diseases that affect the body’s ability to break down particular nutrients in food. If left untreated, IEMs can lead to a harmful build-up of certain biochemical metabolites resulting in delays in physical and/or mental development. Danone Research & Innovation has been pioneering within the field of IEM for over 50 years. It is through this commitment to ongoing research that we have gained a broad and deep understanding of IEM patients and their needs, learning more each day about how we can contribute throughout their life journey.