One common, and harmless, cause of elevated bilirubin is Gilbert's syndrome, a deficiency in an enzyme that helps break down bilirubin. Your doctor may order further tests to investigate your condition. Bilirubin test results also may be used to monitor the progression of certain conditions such as jaundice.
Vitamin A sources:  Vitamin A is found in dark green and yellow vegetables and yellow fruits, such as broccoli spinach, turnip greens, carrots, squash, sweet potatoes, pumpkin, cantaloupe, and apricots, and in animal sources such as liver, milk, butter, cheese, and whole eggs.Function and food sources of Vitamin A.itamin A sources:  Vitamin A is found in dark green and yellow vegetables and yellow fruits, such as broccoli spinach, turnip greens, carrots, squash, sweet potatoes, pumpkin, cantaloupe, and apricots, and in animal sources such as liver, milk, butter, cheese, and whole eggs. List All Nutrient Information.
Vitamin A that comes from animal sources is well absorbed and used more efficiently by the body then other sources of the vitamin. The two main sources of vitamin A from animal products are beef liver and turkey giblets.Other sources of this fat soluble vitamin include: 1  Chicken liver.2  Cod liver oil. 3  Fish oil.itamin A that comes from animal sources is well absorbed and used more efficiently by the body then other sources of the vitamin. The two main sources of vitamin A from animal products are beef liver and turkey giblets. Other sources of this fat soluble vitamin include: 1  Chicken liver. 2  Cod liver oil.