Calcium helps you maintain strong bones and teeth, powers your muscles, and supports nerve and hormone function. While dairy products like milk and yogurt are well-known sources of calcium, many types of fish, plant-based foods, and fortified products also contain this essential mineral. Dairyalvarez / Getty ImagesDairy products are among the richest sources of calcium. Unlike tuna, these fish are canned with their bones, which contain calcium and vitamin D. The bones are so soft and fine that they’re easy (and safe) to chew. Fortified FoodsTanja Ivanova / Getty ImagesIn the United States, calcium is often added to juices, foods like breakfast cereals, dairy, and plant-based milk.