According to the National Institutes of Health Office of Dietary Supplements, sources of vitamin A include cooked sweet potato, beef liver, spinach, carrots, cantaloupe and mangoes. The highest amount of vitamin A is found in liver and fish oils.
Vitamin A is also found in milk and eggs, leafy vegetables, orange and yellow vegetables, fortified cereals and fruit. The recommended dietary allowance of vitamin A for adult males is 900 micrograms. The recommended dietary allowance of vitamin A for adult females is 700 micrograms. The Dietary Guidelines for Americans suggests eating a variety of fruits, vegetables, whole grains and low-fat dairy to maintain a healthy vitamin A level. It is also suggested people avoid solid fats, cholesterol and added sugars, notes NIH.