essential element that is required by plants in relatively small quantities such as iron (Fe). manganese (Mn). zinc (Zn). copper (Cu). and boron (B) (contrast with macronutrient).
Micronutrients are essential dietary elements required by organisms in varying quantities to regulate physiological functions of cells and organs. Micronutrients support the health of organisms throughout life.
In varying amounts supplied through the diet, micronutrients include such compounds as vitamins and dietary minerals. For human nutrition, micronutrient requirements are in amounts generally less than 100 milligrams per day whereas, macronutrients are required in gram quantities daily. A multiple micronutrient powder of at least iron, zinc, and vitamin A was added to the World Health Organization's List of Essential Medicines in 2019. Deficiencies in micronutrient intake commonly result in malnutrition.