What chemical elements are trace elements?

Microelements, together with macro and ultramicroelements, are part of any cell. Trace elements make up only 0.1% of all cell substances. These elements include boron, iodine, cobalt, copper, bromine, vanadium, zinc and some others. They are necessary for the regulation of cell activity, as they are part of various enzymes. They contribute to many processes in the cell. Also, they are part of vitamins. Macronutrients make up 99.9% of the cell and in fact form it, while ultramicroelements make up only 0.00001% of the cell.