B-complex vitamins are important for a healthy functioning liver, as they help break down carbohydrates, proteins and fats in the digestive process, according to SFGate. Vitamin A, vitamin C and iron also support a healthy liver.
B-12 is an essential vitamin for the production of methionine, an amino acid that is often used in treatment of liver disease, according to SFGate. B-12 is found in animal food sources such as chicken, eggs, salmon, milk and some shellfish. It is also found in fortified foods, such as cereals, and supplements.
Folic acid assists B-12 and vitamin C with digestive processes, according to MedlinePlus. It also helps to generate new red blood cells and produce DNA. Folate deficiency is often associated with conditions such as Crohn's or celiac disease, wherein folic acid is not absorbed in the digestive system. Drinking too much alcohol is also a common cause of folate deficiency. Folic acid is found in leafy green vegetables, citrus fruits, beans, liver and whole grains.
Vitamin A and iron work together to support the liver, and adequate levels of both are required to reduce the risk of anemia, reports SFGate. Iron is stored in the liver, and iron deficiency is common among Americans, according to the American Society of Hematology. Good sources of iron include meat, fish, poultry, leafy green vegetables and beans.