Toxic and Essential Elements (22 essential and 17 Toxic Elements) is a dynamic evaluation of minerals and toxic elements in the hair. It can show the levels of nutritional minerals and toxic elements contained in the tissues because it evaluates the actual deposition of elements in that tissue over a period of 3 months. The toxic elements & heavy metals which are tested include Aluminum, Antimony, Arsenic, Barium, Beryllium, Bismuth, Cadmium, Lead, Mercury, Platinum, Thallium, Thorium, Uranium, Nickel, Silver, Tin, Titanium.