Trace Mineral definition: They play a very important roll in health, since even with very tiny amounts of them, the health could be powerfully affected. They are essential in the assimilation and utilization of vitamins and other nutrients. They aid in the digestive process and function as catalyzers of many hormones, enzymes and other essential bodily functions and reactions. They also help replenish the electrolytes lost in perspiration or in intense diarrhea. They protect the body against toxic reactions and poisoning by heavy metals.