Abstract <p>Choline was first declared to be an essential nutrient in 1998. Current research on choline intake has been sufficient for the Food and Nutrition Board of the National Academies of Science, Engineering &amp; Medicine to establish a loose guideline, but more investigation into healthy choline intakes is necessary to clarify guidelines. Choline is intimately involved in human metabolism, as an essential precursor for cell membrane components such as phosphatidylcholine and sphingomyelin, lipoprotein and fatty acid trafficking, and the neurotransmitter acetylcholine. It plays an essential role in histone, RNA, and DNA methylation, creatine synthesis, and more. Choline-related pathologies have already been implicated in multiple severe developmental diseases, such as schizophrenia, Down syndrome, and neural tube defects, and age-related diseases such as Alzheimer’s. Choline supplementation has been shown to alleviate the symptoms of neurodevelopmental diseases, such as Fetal Alcohol Spectrum Disorder and neonatal hyperbilirubinemia. The choline intake by most adults is estimated to be less than the current recommendations. Choline supplementation, particularly for vulnerable populations such as pregnant women, preterm infants, and cystic fibrosis patients, requires further investigation to establish adequate recommendations and to fully elucidate the consequences of malnutrition. Outcomes of choline deficiency and supplementation, such as neurodevelopment, should be measured.</p> Impact <p>What this article adds to the existing literature<UnorderedList Mark="Bullet"> <ItemContent> <p>An up-to-date summary of the metabolism of choline</p> </ItemContent> <ItemContent> <p>A review of the role of choline in normal and abnormal neurodevelopment</p> </ItemContent> <ItemContent> <p>A concise description of sources of choline</p> </ItemContent> </UnorderedList></p>