Mineral supplements are formulated to provide essential minerals that may be lacking in an individual's regular diet. Minerals play vital roles in various physiological processes and metabolic functions. There are many types of minerals, such as calcium, magnesium, potassium, iron, chromium, copper, selenium, and zinc. You can find many of these minerals in a multivitamin supplement or as single-ingredient products, such as a calcium supplement, iron supplement, and more.