NANP Board Practice Exam

Strontium is classified as a trace mineral because, although it is present in the body in very small amounts, it plays important roles in biological processes. Trace minerals are defined by the small quantities in which they are required for health, typically needed in micrograms rather than milligrams. Strontium has been studied for its potential benefits in bone health and has a role similar to that of calcium in promoting bone formation.

In contrast, the other options listed are not considered trace minerals. Boron, while present in tiny amounts in the body, is not typically categorized as a trace mineral in the same way as elements like iron or zinc. Calcium and potassium are both essential macrominerals, required in larger quantities for various bodily functions, such as muscle contraction, nerve transmission, and maintaining strong bones. This distinction helps clarify why strontium is the correct answer in the context of trace minerals.