Vitamin A is a fat-soluble vitamin that is naturally present in many foods. Vitamin A is important for normal vision, the immune system, and reproduction.Vitamin A also helps the heart, lungs, kidneys, and other organs work properly. Some types of fish, such as salmon. 2  Green leafy vegetables and other green, orange, and yellow vegetables, such as broccoli, carrots, and squash. 3  Fruits, including cantaloupe, apricots, and mangos. 4  Dairy products, which are among the major sources of vitamin A for Americans.