Vitamins A, D, and C are essential to the health of the body. Vitamin A is necessary for the proper function of the immune skeletal, reproductive and respiratory systems, as well as for healthy skin. Vitamin D is essential for healthy bones and teeth. Among other properties, Vitamin C acts as a great antioxidant. Taking Kawai Kanyu Drops ensures that you are taking in adequate levels of each of these vitamins. This product is great for people of all ages.