As you age and go through periods of extreme stress, sometimes physically recovering from illness, your nails and hair can become lacklustre and dull. Selenium contributes to the maintenance of normal hair and normal nails. There are other signs common to a selenium deficiency which include infertility in men and women, muscle weakness, fatigue, mental fog, hair loss and a weakened immune system. Added Vitamin A, Vitamin C, Vitamin E and Zinc contribute to the normal function of the immune system. , , Selenium is an essential trace element and contributes to the maintenance of normal hair and nails, function of the immune system, normal thyroid function, protection of cells from oxidative stress and normal spermatogenesis. HealthAid Selenium Plus in its natural form, which is best absorbed and utilised in the body. Vitamin C and Vitamin E also contribute to the reduction of oxidative stress.