Reviewing almost 200 publications, researchers concluded that previously conducted controlled studies investigating whether differences exist between organic and conventionally produced milk have so far been largely ambiguous, due principally to the complexity of the research question and the number of factors and variables that can influence milk composition. "This review presents one of the most detailed treatises to date of organic versus conventional milk composition," commented Matt Lucy, PhD, Professor of Animal Science, University of Missouri, and Editor-in-Chief of the Journal of Dairy Science®.