A deficiency in iron results in fatigue, poor work performance and a decrease in immunity. Iron is an essential component of proteins involved in oxygen transport. 
Iodine is best known for its major effects on thyroid function, it is the main component for the thyroid hormone thyroxine. Iodine also has effects on controlling the effects of estrogen on breast tissue, and protection the body against radioactivity exposure. 
Chromium is known to enhance the action of Insulin in the body, a hormone critical for the metabolism and storage of carbohydrates, fat, and protein in the body. 
Selenium is a powerful antioxidant that helps prevent cell damage from aggressive free radicals. Free radicals are know to contribute to the development of chronic disease like cancer and heart disease. Selenium helps regulate the thyroid and play a major role in boosting the immune system. 
It is a critical component of over 24 different digestive enzymes. It helps in the healthy breakdown and storage of carbohydrates in the body. Zinc is famous for it’s ability to boost the body’s immune system. Zinc plays a key role in collagen formation and healthy tissue support.
Zinc is important and versatile in the body, this is why Zinc Citrate is my 2011 top mineral.
 Institute of Medicine. Food and Nutrition Board. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium and Zinc. Washington, DC: National Academy Press, 2001.
 Porte Jr. D, Sherwin RS, Baron A (editors). Ellengerg & Rifkin’s Diabetes Mellitus, 6th Edition. McGraw-Hill, New York, 2003.
 McKenzie RC, Rafferty TS, Beckett GJ. Selenium: an essential element for immune function. Immunol Today 1998;19:342-5.
Dr Elias Markou, ND