Abstract Background Functional gastrointestinal disorders (FGIDs) are groups of disorders involving digestive symptoms that chronically persist despite the absence of organic abnormalities in the gastrointestinal tract. Representative FGIDs include functional dyspepsia (FD). irritable bowel syndrome (IBS). and functional constipation (FC). https://parisnaturalfoodes.shop/product-category/vitamin-k-a-d3-liquid/