Nuvi-A & D properly utilizes calcium and phosphorus  necessary for strong bones and teeth. Nuvi-A & D  helps maintains a stable nervous system and normal heart action. Nuvi-A & D also aids inassimilating vitamin A  which is why it is very important in taking vitamin A and D together for the maximum benefit. Vitamin A (Beta-Carotene) is necessary for growth and repair of body tissues, helps maintain smooth, soft disease-free skin. It also protect the mucous membranes of the mouth, nose, throat and lungs, thereby reducing susceptibility to infections.