Selenium deficiency is becoming the leading and major cause of heart, thyroid, kidney, gastric and muscle problems. Selenium is an important antioxidant which regulates thyroid hormone, improves reproduction and helps in DNA synthesis. People who are living near industrial establishments are highly susceptible to selenium deficiency. Men and women who are above fifty years of age may suffer from selenium deficiency. If an individual finds abnormal nails, suffers from severe hair loss, frequent bouts of fatigues and join weaknesses he should visit the doctor immediately. Doctor will prescribe selenium test which will provide vital info about selenium deficiencies.