What is a mineral that the body requires in very small amounts?

The term "trace mineral" refers to minerals that the body needs in very small quantities, typically measured in micrograms rather than milligrams. These trace minerals play crucial roles in various bodily functions, including enzyme activation, hormone production, and the maintenance of healthy tissues. Examples of trace minerals include iron, zinc, copper, and selenium.

In contrast, macro minerals are required by the body in larger amounts, typically in milligrams, and include calcium, magnesium, potassium, sodium, and phosphorus. Essential minerals is a broader term that encompasses both trace and macro minerals necessary for health, while metallic minerals typically refer to elements that have metallic properties and may not specifically denote the amount required by the body. Hence, "trace mineral" is the most accurate choice for indicating minerals needed in small amounts.