Ultratrace minerals mythical elixirs or nutrients of concern?

Demonstration of the nutritional significance of the ultratrace elements has resulted from studies indicating enhanced need in organisms exposed to various metabolic, hormonal, physiological and nutritional stresses. These studies indicate that some ultratrace elements, namely boron and silicon, will be found to be nutritionally important. The dietary lack of these elements may result in suboptimal function and composition of bone and brain.