Which of the following is not a major mineral?

Iron is classified as a trace mineral rather than a major mineral. Major minerals, also known as macrominerals, are required by the body in larger amounts, typically more than 100 milligrams per day. These include minerals like calcium, potassium, and chloride, which play critical roles in various physiological functions such as bone health, fluid balance, and acid-base balance.

In contrast, iron is needed in smaller amounts, usually less than 100 milligrams per day, and is essential for functions like oxygen transport in the blood and energy metabolism. While important for health, the classification of minerals into major and trace categories is based on the quantity the body requires, making iron a trace mineral. Understanding these classifications can help in dietary planning and addressing nutritional deficiencies.