{Reference Type}: Journal Article {Title}: Vitamin D may alleviate irritable bowel syndrome by modulating serotonin synthesis: a hypothesis based on recent literature. {Author}: Yu XL;Li CP;He LP; {Journal}: Front Physiol {Volume}: 14 {Issue}: 0 {Year}: 2023 {Factor}: 4.755 {DOI}: 10.3389/fphys.2023.1152958 {Abstract}: A number of studies found that serotonin plays a vital role in the development of depression and irritable bowel syndrome. Recent studies showed that vitamin D was associated with regulating the synthesis of serotonin. This review focuses on the recent progress in the relationship between vitamin D and serotonin synthesis.