Micronutrients are essential vitamins and minerals that the body needs in small amounts to function properly. Unlike macronutrients (such as carbohydrates, proteins, and fats), which are required in large quantities, micronutrients are needed only in trace amounts. Examples of micronutrients include vitamins A, C, D, E, and B complex, as well as minerals such as iron, magnesium, and zinc. These nutrients play important roles in various bodily processes, including metabolism, immune function, and cell growth and repair. A diet that is lacking in micronutrients can lead to deficiencies and health problems, which is why it is important to consume a balanced diet that includes a variety of foods that are rich in these essential nutrients. In functional medicine, micronutrient testing may be used to identify deficiencies and tailor nutrient supplementation and dietary recommendations to individual needs.