Trace mineral analysis is a test which measures the mineral content of your hair. 

Mineral content of the hair reflects the mineral content of the body's tissues.  Minerals are needed for almost all enzyme reactions with in the body.  Without enzyme activity, life would cease to exists. If a mineral deficiency or excess exists in the hair, it usually indicates a mineral deficiency or excess within the body, or bio-unavaiability.  Various mineral imbalances, as reaveled by hair analysis frequently lead to metabolic dysfunctions before any symptoms become apparent.   That is why a hair analysis test is preventive as well as a useful screening tool.