trace element
trace mineral
microelement

The body needs trace minerals in very small amounts.

During his time at this institute he also worked on the impact of trace minerals in water on health.

Can this be scattered over my vegetable garden to add trace minerals?

As such it is an essential trace dietary mineral for all animals.

Your body needs just small amounts of trace minerals.

So he is taking selenium, a trace mineral found in plants.

The trace minerals, like some vitamins, have very particular functions.

He may have been picking up trace minerals from the dust in the air.

Copper is an essential trace mineral that cannot be formed by the human body.

The element is a required trace mineral for all known living organisms.