Vitamin A is a family of fat-soluble vitamins.
Vitamin A is found in fish oil, liver (pork, lamb, chicken, turkey or beef), butter, and eggs.
Many plant foods contain orange pigments called provitamin A carotenoids that the liver can convert to retinol. Beta-carotene is a provitamin A carotenoid found in many orange or yellow vegetables or fruits including carrots, sweet potatoes, spinach, cantaloupe, red bell pepper, apricot, peaches, papaya, asparagus. Lycopene, lutein, and zeaxanthin are also carotenoids commonly found in food, but your body cannot convert them to vitamin A.
Vitamin A helps immune function, is necessary for the production of bone, protein, and growth hormone, helps maintain the health of the skin and intestinal lining, has potent antioxidant activity.
National Institutes of Health, Office of Dietary Supplements