Food fortification with vitamin D is a way to increase low intake. A new tool was created using data on Danish diets to figure out the best foods to fortify. The tool showed that fortifying certain food groups can safely boost vitamin D intake. By adjusting the level of fortification, the tool can optimize the selection of food groups. The tool suggests that fortifying milk, cheese, cereals, fats, and juice can help people get enough vitamin D without going over the safe limit. This data-driven approach offers a quick and easy way to test different fortification strategies.