Vitamin A is a fat-soluble vitamin that you can either get from animal products such as liver, fish, and dairy or you can get precursor chemicals, such as beta-carotene, with which your body creates Vitamin A from yellow and orange fruits and vegetables such as cantaloupe, apricots, carrots, and sweet potatoes.
You may best know vitamin A as being essential to good vision. It produces the pigments in the retina of your eye, which help you deal with changing light. It also helps to form and maintain soft tissue, mucous membranes, and skin throughout your whole body, as well as teeth and skeletal tissue.
Vitamin A also has protective effect in your immune system. It helps your skin and mucous membranes repel hostile microbes more effectively. Beta-carotene is an anti-oxidant with protective effects against cancer.