Margitta Dziwenka, DVM, DABT, is the director of preclinical and companion animal services at Nutrasource/GRAS Associates (Guelph, ON, Canada; https://www.nutrasource.ca). Dziwenka is a registered veterinarian as well as a board certified toxicologist. She has many years of experience with companion animals as a practicing veterinarian in addition to experience in laboratory animal medicine. Dziwenka also brings extensive experience in designing and conducting preclinical research studies, including safety, pharmacokinetic, and efficacy studies, both as a study director and study monitor, in a variety of laboratory species. She is well versed in regulatory aspects including Good Laboratory Practices, submission of Generally Recognized as Safe (GRAS) dossiers, and New Dietary Ingredient (NDI) notifications. Dziwenka has managed a large Canadian Council on Animal Care (CCAC)–accredited university facility and has over 10 years of experience as a member of Institutional Animal Care and Use Committees.