Tiredness and lack of energy may be accompanied by a weak immune system, potentially leading to an increased vulnerability to illnesses and delayed recovery. If you are also experiencing sensitivity in the eyes, it could indicate insufficient levels of Vitamin A. HealthAid® Vitamin A and D Capsules provide readily available Vitamin A for the body to use in the support of several processes. Vitamin A contributes to the maintenance of normal vision, skin and mucous membranes. It also contributes to normal iron metabolism and the normal function of the immune system. It is also important in the process of cell specialisation.