Minerals play a vital role in several of the body's metabolic functions. Unlike some vitamins, minerals are not produced naturally in the body and must be taken externally. A physiologically correct composition of a diverse array of minerals is required for normal healthy metabolic activity as many of these minerals act as co-factors with one or the other enzymes. An increase or decrease in the concentration of these minerals beyond physiologically tolerable limits may lead to severe medical conditions. So, it is advisable to keep a track of essential minerals in your body. There are many mineral check kits in the market that require just a hair sample in order to determine the levels of various essential minerals including Calcium, Chromium, Cobalt, Copper, Iodine, Magnesium, Manganese, Selenium, Strontium, Sulfur and Zinc. Some of these kits also detect various harmful elements like Aluminum, Antimony, Arsenic, Bismuth, Cadmium, Lead, Mercury, Nickel, Tin etc. Such kits are based on hair tests as the minerals rotating in body gets entrapped into the hair through the hair shaft which is directly connected to the arteries, through the core of the hair, called cortex.