MASON VIT A 10000iu X 100 SOFTGEL is important for normal vision, the immune system, and reproduction. Vitamin A also helps the heart, lungs, kidneys, and other organs work properly. Promotes healthy vision, immune strength and protects cells. Used in excess, it can be quite irritating, however, other functions of vitamin A include the formation and maintenance of teeth, bones, soft tissue, white blood cells, the immune system and mucus membranes. Beta-carotene also acts as an antioxidant, protecting cells from free radical damage.