Any chemical element found in trace concentrations in the human body, usually less than 0.1% by volume, is referred to as a trace element.
The majority of trace elements are either nutritionally required, likely essential, or potentially harmful.
Micronutrients are known as trace elements because they are required in small amounts but are necessary for growth, development, and a variety of physiological activities.
Iron, copper, manganese, zinc, cobalt, and other trace elements are examples.