Single mineral supplements allow those who are in need of one particular mineral to get just that mineral without the other unnecessary minerals involved in a multi mineral supplement. A deficiency in a single mineral, such as calcium, magnesium, or zinc, is more effectively addressed by a single mineral supplement than one with a wide variety that may not contain enough of that particular mineral. Additionally, single mineral supplements are good for those who demonstrate a sensitivity to excesses of certain minerals or are addressing a health issue that is arising from a single deficiency. Each mineral functions in a different way within the metabolism, and if it is targeted  supplements that you desire, a single mineral supplement will deliver.