Editorial: The role of vitamin D in gut health and disease in children

The metabolism of vitamin D relies predominantly upon the synthesis of cholecalciferol (vitamin D3) in the epidermis following exposure to sunlight (specifically ultraviolet B rays) and the subsequent hydroxylation to active forms in the liver and kidney (1). Vitamin D can also be sourced from natural dietary sources such as fatty fish or from supplemented foods such as bread or cow’s milk.