Manganese As Citrate 5 Mg 100 Tabs. Minerals are inorganic substances that cannot be synthesized in the body, and therefore must be supplied through the diet. They actively participate in regulating a wide range of physiological functions. Minerals are divided into two main groups: macro minerals and trace elements (this classification is based on the amount that the body requires of each of them). Generally, when the body needs to take in less than 15mg of a mineral daily, it is classified as a trace mineral. Manganese is an essential mineral for normal energy metabolism and necessary for the development and maintenance of healthy bones. Also for the normal function of connective tissue and the immune system, as it contributes to the protection of cells against oxidative damage.